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My bank refused to do a charge back
Call Comcast during a non-peak time (first thing in the morning?), wait on hold, and politely explain what happened and request a $50 credit. Also politely request that your premium support request be handled for free given how much hassle you've had getting disconnected. They'll be able to tell your premium request was never answered because there are no notes on your support tickets. Calling them is much easier than any of your other options.