New job trying to contact previous employer

Hi all,

I'm in a bit of a situation and I need advice. I applied to a job with all my work history,references, etc

My last job was as an IT Assistant. The company i worked for was using software illegally. When i asked the it manager about it they let me go the next day. So i reported it to the BSA. On my app, i selected please do not contact. Now the new job is tryiing too contact them and can't get through to my supervisor. What do I do? I'm stuck away from home waiting on this :/

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