SMS Roaming deactivation

I have been trying to deactivate my SMS roaming since the 28/04/2016. I have phoned Vodacom customer care twice on the 29/04/2016 and they told me that there is a problem on so they are going to escalate the problem. 0n the 30/04/2016, I phoned again and they said that the problem is still there but they will phone me back, and they NEVER DID. I phoned them again twice on the 01/05/2016 and they told me that the are going to escalate the problem again and phone me back which they NEVER DID again. I phoned on the 02/05/2016 with still the same problem and they again told me that they are escalating the problem and will phone me but failed to. On the 03/05/2016 I have phone again and was told the same story. On the 04/05/2016 I have phone again with no change in they story and that they will phone me back but fail to do so. The service that I have been receiving from Vodacom is disgusting and very poor as they can not resolve my problem or even phone me back regarding what is happening.