Extremely disappointing customer service

I had an ******* upgrade done on my phone by Vodacom. I have been trying for almost a week now to have this reversed. Vodacom keeps passing the buck and keep promising to have it resolved, but they don't. I phone their call centers and my while I am holding for escalations, my call gets ended. This is really frustrating. Furthermore, when the ********** upgrade was done, I had some remaining minutes and data, which disappeared when this new contract started. I have had to spend extra money on airtime and data. The airtime gets depleted quite quickly and then I am inconvenienced as a result. I am highly annoyed and frustrated. I have been a loyal customer for years and I am disappointed that this is how Vodacom is treating me.