Changing agreement/taking payment without consent

We were on the Waya Waya PrepaidFone service since early 2009 at a cost of R120.00 per annum (and obviously paying the prepaid airtime). <br> <br> We lately noticed that there were hardly ever funds available on our phone anymore even though we basically never used the phone to make calls. <br> <br> We monitored this and found the balance to be reduced EVEN WHEN NO INSTRUMENT WAS CONNECTED. When we visited Telkom in Centurion Mall, we were informed that the Waya Waya PrepaidFone service has been suspended approx. 18 months ago and that we are now charged R20.77 PER WEEK for using a Prepaid service.<br> <br> Telkom, I need an explanation. HOW CAN YOU SUSPEND OUR AGREEMENT WITHOUT NOTIFYING ME AND ON TOP OF IT DEDUCT MONEYS FROM ME THAT I HAVEN'T AGREED TO? PLEASE COULD I GET PROOF THAT I WAS NOTIFIED AND HAVE A COPY OF THE SIGNED REPLACEMENT AGREEMENT????? How dare you change any contract without notice and deduct moneys before prior agreement/consent - this is totally and utterly unacceptable!<br> <br> Needless to say: you lost a client.