They didn't install all of the requested accessori...

They didn't install all of the requested accessories for my motorcycle and overcharged me by more than $500 vs the agreed-to price and now won't even reply to address the issue. Pathetic customer service, something I'd expect from the phone companies, not a local small business that relies on its reputation for referral business. I've even contacted the president and there's been no action, so it comes right from the top!