Unhappy contract customer

I really need someone to help me understand why it’s such a schlep trying to end my contract with VC. I had called into the call center in April to end my contract with the SP (which was due to end on the 4th of Sep) and was advised by the agent I spoke to, to let it run its course and call in at the beginning of August to end the contract as, and I quote, “that will be the last month and payment of your contract”. I called in as advised and was told that August would not in fact be my last month but I will be charged for August and September? How, when I was told August will be my last month for the contract? Would I not only be charged a pro rata rate for the 4 days of September?