Impossible to cancel the service.

I am struggling to find the words of frustration. I officially cancelled back in March with the call center which is impossible to get hold of. I got my reference and thought all was ok. In April I was charged again, I called and again got an apology and was promised the funds taken would be returned. Guess what, in May the same thing happened and June. Eventually I cancelled the card they somehow kept on debiting. Now every month I get multiple phone calls demanding payment and messages. Still waiting for my refund and a customer service person to contact me. As a long standing customer this is beyond annoying and frustrating.