Camera does not work after 3 month

I am very frustrated in dealing with the call center and In groupon's case unless you call (at your expense) you wait and wait for responses to emails. I sent an email and they say they will respond within 48 hours, and of course they don't so you call and they say they will send you an email back, you ask to speak to a senior manager and of course, usual answer \they are not available"and will call you back"