NO ADSL FOR A WEEK!

I've been in constant contact with Call centre since Monday 22 June. I was made to reset modem settings and perform a heap of changes to my settings only to learn the exchange was down. Received sms on Tues to advise exchange is up, got home red light on modem. Called Telkom again. Was advised high support would contact me. No contact on Wednesday. Called back on Wednesday evening spent some 4 hours on phone. Made to reset settings again. Contacted on Thursday, advised I was at work I couldnt do anything then. Not contacted on Friday. Called again on Saturday - was told someone would contact me Sunday. Just called them again to follow up and was told I wont hear from them they will test the line and see what they can do. Really shocking service - the problem persists into the week when I cannot speak to Telkom during the day!!! What is the solution? Where can I complain? I don't see any customer service contact. I spend over R10,000 per month with Telkom and I'm FED UP WITH YOUR POOR SERVICE!!!! Also discovered I've been paying for 10mb line and I've only been receiving 2mb! Was reported and no feedback!!!