Cancelation of contract that ended

My contract ended in April this year. I've send multiple emails as well as calling in where you sit and wait for someone anyone to answer, but no answer at all. I'm getting statements every month with ridiculous high amounts whereas my contract ended already and I canceled it or do they say they canceled it in April. They are a ***** company and the most ridiculous and pathetic service ever. I'm handing this matter over to my attorneys to deal with them. Never take out a contract with Mtn