Shocking Service from Virgin Mobile

I am shocked at the service I have received from Virgin Mobile. I cancelled my contract after the 2 years were up in November 2013. The told me that my last debit would be at the end of January. at the end of February I was debited again so I immediately phone Virgin mobile and they apologized for there mistake and said they would refund me as it was an error on their side. At the end of March they then debited again, I immediately phoned my bank and told them to reverse it as it was an unauthorized Debit order. again today they have debited my account. This is the one of the reasons I cancelled with Virgin mobile as there service is shocking, I have not even gone into how long i was on hold or how many times they dropped the calls during my numerous phone calls.