How do you deal with sponsorships who never answer your emails or phone calls?

I run a jazz quintet which is sponsored by our local town. The community loves us but our sponsorship is very difficult to communicate with. Never return phone calls, emails, NOTHING! Very difficult to plan logistics and communicate to my musicians because the town doesn't tell me what is needed to run the... show more I run a jazz quintet which is sponsored by our local town. The community loves us but our sponsorship is very difficult to communicate with. Never return phone calls, emails, NOTHING! Very difficult to plan logistics and communicate to my musicians because the town doesn't tell me what is needed to run the performance such as correct time, dates, etc. Everything is either vague or no answer and I have to guess. What do I do???
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