Network/Internet Signal

I have a Telkom Mobile cellphone contract. For the past week(if not longer) my network signal had been so poor and unstable I can barely use my phone as nothing works because the signal keeps dropping, disconnecting and doesn't remain stable enough to even roam. I am at my wits end and fed up as literally nothing is working on my phone Apps keep disconnecting due to bad/no service signal... I gave logged a complaint withthe call centre but no luck in getting this matter resolved...I have 3 contract with them & yet I can't even use the most basic services for longer then 1min without being disconnected.