Telkom Mobile calls keeps on going silent during call or disconnecting during calls, using my cellphone as business phone

I am so fed up with the absolutely terrible telkom mobile cellphone signal. I have a contract with telkom and I use my cellphone as my business phone. Lately everytime I phone the call goes silent after almost a minute in call or the phone gets disconnected and this happens with every call or my clients can't hear me or the line breaks up, then I have to keep on phoning my clients back again and again, we are still busy talking about important business information and then suddenly I can't hear anything, then I or my clients needs to phone again and then repeat everything again and again for numerous times! and the other thing that happens is people say they are trying to phone me but i don't get any call or miss call notification???? Or an important client will try phone me, then the call does not come through, it only comes through as a missed call afterwards......How am I supposed to run a business like this Telkom????? I buy allot of Minutes of airtime every month but for what? I don't want to hear any apologies, I just want the solution and problem to be solved ASAP as I cannot run a business with this pathetic cellphone signal. and Yes I have phone 10210 and 081180 and my case number is ***5