Telkom Is Changing my Landline Number Randomly!

On Tuesday, 19 May, my internet went down. After 4 hours, I realized that there had to be something wrong, and I phoned my internet service provider. I was advised by my service provider that my landline number with Telkom changed! This occurred without my knowledge! My service provider linked my ADSL to the new number, and everything worked - for a day. Today, on 20 May, I came home and discovered my internet was off AGAIN! I phoned my service provider, and was once again advised my landline number changed - AGAIN! This is now the third time Telkom has changed my landline number, in two days. WHAT IS GOING ON??? You have not advised me of this, and I am sick and tired of spending all my airtime every single evening, phoning my service provider to sort this out, where it isn't even their fault! I require an explanation URGENTLY. This is a pathetic way to treat a customer who has always been paying upfront on their Telkom account, and who has always been in credit. Your urgent, speedy response will be awaited.