Telkom Mobile Unable to receive calls

Both my wife and I have Telkom Mobile mobile accounts/numbers. In the last few weeks we have received many complaints from people trying to contact us via our Telkom numbers. The attempt on their phone no matter the mobile network ( Non Telkom mostly ) , from which they call, comes up instantly with " Call Ended". The call does not even begin the initial connection or handshake. I have a Dual Sim enabled Mobile Phone and if call is made to my non Telkom Sim /Number, the call immediatley goes through? What is Telkom doing to resolve this as I have recently queried other Telkom Mobile subscribers and they are having similar issues!