Slow ADSL - for almost 2 months

I have a 4Mbps contract with Telkom and pay more than R500 per month for this function. It has been working perfectly till mid June. I have logged 3 fault reports that are continually removed as they see the problem as fixed. I have phoned the call center numerous times. They say they can't do anything about it except make notes. I had an appointment with a technician at my house this morning at 7h30. He did not pitch - waited till 8h30 and his phone was off. Phoned call center who gave me a number that I could phone to get hold of technicians. No one answered and number stopped working after third call. Phoned call centre again who said that they can't do anything from their side. Need to speak to technician. I have been patiently waiting for Telkom for two months now and still kept my account up to date. So I have paid R1500 for internet that can't load the speed test. The last speed test that took 15 minutes before it was completed indicated that my internet download speed was 0.06Mbps and upload speed 0.01Mbps. Are they going to refund my subscriptions? Should I cancel my contract? Should I stop my debit order as I am not getting any service for the money I am paying?