Vodacom airtime disappearing!!!!!!!!

I have been buying airtime for weeks now and been getting the value of my airtime as a reward but all those times I have never been allocated the airtime and it end up using my own data. Yesterday I bought airtime for R50, paid for airtime advance of R22 and left with R28 plus the R50 airtime that I should have been allocated. I bought power hour of R8 and was supposed to be left with R20 and to my surprise I'm left with R6 this morning. I have experienced this way too many times with R100 purchases and I contacted them via Facebook and nothing was done. I'm now beyond fed up with vodacom ****ty rewards that never get allocated and they consume our airtime for no reason. I'm tired of having my airtime disappear. This is utter nonsense. I contacted them on the 22 June 2020 and no one even bothered to solve this ****.