Cannot receive non telkom calls on cellphone, only Telkom for the past 6 months!

We switched 2 cellphone numbers from Vodacom to Telkom on the 30 gig family package in May 2017. The plan was to also link 2 other numbers on the same package. Unfortunately one of the numbers has a problem. It can only receive calls from Telkom cellphone numbers and some Telkom landlines. It cannot receive non telkom sms's. So for the last 6 months my wife cannot do her banking, vitality etc. on her cellphone. The past 6 months we visited Telkom Canal Walk, Tyger Valley, Parow Centre and lodged more that 10 separate complaints in total, without any success. We have also phoned the call centre without any success. Every time we lodged a complaint we were told that the complaint will be resolved in 24h-72 hours, but unfortunately nothing happened. No calls, no emails, no feedback. Nothing! Telkom Canal Walk, once did a sim swap and "re- ported" the number. Then she had no connectivity for that 2-4 days. Unfortunately that also did not solve the problem. We are now lodging a complaint with ICASA