Poor service

My last contract I received a Sony Experia. I took it back about 4 times for a problem with the charging socket. The last time more then 6 months ago, I took it in for the same problem, the manager himself put the charging cable into the socket and when he took it out the socket came out with a part of the phone. He send it in and after a few days informed me that I must pay for the repairs. When I asked him about it, he said that he will handle the matter, as I say it is more then 6 months and still didn't' hear from him. I think of changing all my contracts to another service provider.