Virgin Active continue to charge after membership cancelled

Toward the end of 2017 I cancelled my membership at virgin active. I filled in a “just before you go form” at Morningside and I called in to confirm. I have not been back to make use of their facilities and have not heard a word from them until recently I have started receiving DAILY calls from VVM attorneys claiming I owe Virgin active money! Is this a joke? Virgin active get your act together. How do you charge people for cancelled services that have not been utilised. Someone had better sort this out! FAST!