Full time retail employee being scheduled (drastically) less than 40 hours, not the first time. How to address?

So I (20M) am a full time employee for a large grocery chain. I've worked for the company since I was 16, and I've built my career thus far through college (almost done with an associate's degree) with the company. From the time I was 17 or so onward, my performance and relationships with my bosses were good enough to get me all the training I desired, and I was trained to be a department "lead" (the step below a department manager, kind of assistant manager if you will, a full time position), and I was pretty much always given full time hours even though I was a part time employee for that fact - I had early release from school at the time which made it possible. I worked everywhere I could, every department, in other stores, and I quickly made a name for myself. Now, I have a lot of promotion potential which I am recognized for; it is a given that I will be a department manager myself by the end of next year, I'm on all the promotion fast-track lists.

Fast forward to now, I'm 20 and an ACTUAL department lead in a department taking up 36% of the total sales in the store, second only to the grocery department in terms of size. When my boss is gone, the department and staff are mine, and he is often gone. I am no longer in my original store of hire, and this is in part where the problem I'm facing has arose. My current boss is lazy. He's in his mid 30s, is the Region Lead (basically supposedly "the best" at what he does), and is pretty much only good at delegating things down. I am not exaggerating when I say the department would not run if it was not for my efforts in keeping it going, he doesn't do the simple things and freaks out over the complex. Him and I also do not get along, at all, and it's hurting my professional appearance; two mediated meetings and a million disagreements later and we're still not clicking on all cylinders. But, I took this job, which was a promotion, as a FULL TIME position. Full time = 40 hours. Just in the last two weeks, he scheduled me a 32 hour week (this current week) and a 34 hour week (next week, which I just saw in email this morning). I'm livid.

The hours argument has been a long one with him going back to when I took the job in February and I had figured he'd gotten it because it wasn't an issue for multiple months, but here lately it's becoming a problem again. I am totally financially independent, I might still live with my parents but I pay all my own bills, I pay rent, I am paying my own online college costs, etc. I just spoke to our Assistant Store Manager earlier this week (Store Manager is on vacation) and told him 32 wasn't cutting it, I have a living to maintain, I needed more hours, he ended up giving me 2 extra hours and that was all they could do. So I'm going to have to pull from my PTO bank (which is large, I admit, but i have plans for it) to cover THIS short week on my check, and then I get today's schedule in email and find he gave me 34 hours next week? I'm on the verge of going in today and telling them that if they don't add hours to my scheudle I will refuse to work until they do, and if not start calling other stores looking for a transfer, but I don't want to go that route yet, but I'm mad. This shouldn't even be an issue, because I am full time. I just don't know how to handle it at this point when I made it pretty clear earlier this week to the ASM and my boss that if it happened again there would be an issue.

Tl;dr - I'm full time, boss scheduled me 32 hours this week and 34 next week, not the first time he's done this and I have raised the complaint already about this week's, how do I escalate the complaint about next week's hours issue?

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