I was an associate title employee, who did manager’s work. How to put that on a resume?

I was an associate marketing manager for a big company that had a small office in a small city. We ran like a small company. My manager who was the marketing manager started to check out and go to meetings at the national office while I was working for him and I did his work. I would call him and he would say “I’m your manager and i give you permission”. I would do his job managing people, ideas and ad buys. I was never paid more, nor did my title change. Later I asked him for a reference and to look over my resume and he told me that I lied saying I did his tasks. I no longer use him as a reference.

How can I add duties that were outside my position so that I can apply for appropriate positions?

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