2011 Buick Enclave Audio Problems

I bought a 2011 model Buick Enclave one month ago. It's stereo system began not working. The former owner said that it was working properly. I went to GM dealer last week and they said it must be updated for 800 CAD. I didn't accepted this. Three days later it started to work by chance. But yesterday it wasn't working again. I don't know what's the real problem and I'm not sure whether it will work if I pay 800 CAD or not. I think this is a repeating issue in Buick Enclave. Can anybody else help me about this? Thank you for your help.
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