XXXX is billing me for tests already paid for by my insurance company. XXXX XXXX is a tier 1 HMO provider for my insurance company. They have been paid, but continue to harass me with bills. I have no deductible or co-pay with my insurance. Now Quest Diagnostics have turned me in to a collection agency ( Credit Control , LLC of XXXX MO-Account # XXXX ), and have billed my credit card {$100.00} without my permission. I have mailed them EOB 's from my insurance company and they have been FAXED to them as well. Hours on hold with their phone support. Staff at XXXX XXXX facilities refuse to answer any billing questions at their local facility, hours of wait on hold if you try to call them. I have used XXXX customer service portal and the only response from them is a form letter in email.