POOR SERVICE!!!!!!

Having problems in resolving a fault with my business phone line.It is now 3 weeks since we started reporting the fault with no success.(using 10217 and telkom website) Somehow the last 2 digits on my line was changed after the first attempt to fix it...1970 is now 1907...???Now when i phone my business i found out a residential person is using my phone line and Telkom don't have a problem with that....!!!!!! Nobody at Telkom can resolve this problem and i am loosing business on a daily basis the past 3 weeks.What to do now????? This morning i recieved an sms stating that my problem was resolved....,NO IT IS NOT!!! Telkom this is why i haven't renewed my contract ....1041CTK160315 , 315CTK260315 , 317CTK260315 , 720CTK270315