Sprint I paid a cancelation fee of $350 when trying to get promo cut your bill In half and now they are charging me $970 because of their error after I canceled it within 30days. Overland park Kansas

 I went to take advantage of their cut your bill in half and they will pay your current carrier cancelation fees and last bill to get you to be a customer with sprint. I signed up the sales rep said it would take 2-4 weeks for this to go into affect at exactly 30 days they still had not put me on the it your bill in half promo and I had paid them $350 for any cancelation fees if canceled. I returned their phone and had Verizon speak with sprint on the phone with me and they said to both me and Verizon that no cancelation fees would be charged and that as long as I returned the phone no penalties would apply. All of a sudden I'm being hound by collection agency for a bill of $970 for a service that wasn't even active more then 30 days and I had already paid them $350. I have tried several times to speak with sales rep who took the iPhone from me and said he would handle this and not to worry about this bill he would clear it up I have s video of him saying this. I just today received another bill for $970.38. It's affecting my health and my good credit. This wrong what they are doing to people.