Bad Cancellation and billing services

The service at TELKOM is really disappointing. My contract ended on the 7th of July and I sent an Cancellation request on the 1st of june(30 days notice), I was debited in july(prorated amount) and now I receive a invoice saying I'm being debited again in August. I've contacted the call centre... Spoke to several consultants( names not taken) they placed me on hold for about 15-20mims (spend R50s airtime) with no help. I also spoke to Nthanthla who is a really rude agent.... I don't expect that kind of customer service from such a big business... I've asked to be transferred to the complaints department, and I was told that they don't have one. I won't take up another contract with TELKOM and wouldnt suggest it to anyone else