Account debitted after contract ended

I had a 2 years contract with Virgin active. It came to an end in march but they still debitted my account in April. I called virgin active tramshed and they said I need to send an email notifying them, of which I did. But that meant nothing because its May and they debitted my account yet again. Keneilwe is the responsible person as I spoke to her twice about this. I am very furious, such incompetency from a big company. I want my monet back!