Unauthorised pyments taken from my account.

How do I get AVG to stop taking annual payments from my account? For four years they have billed my account via an e-mail address I cancellled more than four years ago, The security originally purchased was for computers I no longer have in my possession. I have tried many, many times each year to get this subscription cancelled both by using customer support on line (which was useless on every occasion) and by cancelling my PayPal account (they have taken the money frsom my account each year on behalf of AVG,, but it would seem that AVG nor PayPal bother to query why the licences have not been activated . Pay Pal said it was a problem that I needed to sort out with AVG and AVG support say NOTHING!!  We are now coming up to the beginning of September and I need to be assured that I will  NOT find a further £49.99 is taken from my account on or about the 24th September.  I DO NOT HAVE THE OLD E-MAIL ADDRESS which was used when I took out the security with AVG.   PLEASE WILL SOMEBODY HAVE THE DECENCY TO STOP TAKING ANY MORE MONEY FROM MY BANK  ACCOUNT. I SUPPOSE IT IS TOO MUCH TO EXPECT THEY WILL DO THE DECENT THING AND REPAY ME FOR THE ALMOST £200 they have taken from me.

Elizabeth