Telkom Reception and other problems

I have written many time's before about this we have mostly no signal in our area all customers have this problem in our area. Now when i call my son after walking around to get somewhere to find signal to call him it say's his no has changhed or does not excist but it is still in use this has bee happening the past 2 weeks or more now it is Telkom to Telkom call and even when i phone Telkom to his Cell C number the same probem then it ring engaged but when i call my Son Vodacom to his Telkom or Cell C no then i get through. #Telkom please fix this problem and the huge signal problems as i said before experienced by all Customers in a 60 to 80km raduis.