BILLED FOR BLACKBERRY SERVICE I DON'T HAVE.

I KEEP GETTING MESSAGES FROM VODACOM BLACKBERRY SERVICE BILLING ME FOR SERVICE i DO NOT HAVE. I HAVE A PAY AS YOU GO NOKIA.EACH MESSAGE SAYS THEY HAVE TAKEN R59 FOR THE SERVICE I BUY BULK AIRTIME SO IT IS HARD TO TELL IF THEY TOOK MONEY OR NOT. I GOT 18 EIGHTEEN!! MESSAGES IN A ROW ONCE. I HAVE PHONED, CHATTED, EMAILED AND GET ROUTINE RESPONSES AND NO HELP. I DID GET ONE R59 REFUND! THE LAST RESPONSE I GOT SAID \SYSTEM ERROR'<br> I AM FED UP."