Vodacom airtime ****

Extra airtime ****. Today I loaded R50 airtime, for which I received R50 extra airtime, however, this was a ****. After purchasing a data combo bundle and settling my airtime advance balance I was left with around R14 airtime plus the R50 "extra airtime". I then made a voice call, but was cut off after a short while. On checking my balance, I found that I had R0.01 airtime and still the R50 extra, I then tried to make another call using this R50, but was informed that I had reached my call limit and must recharge. When I checked my balance again, the R60 extra was no longer present. I added another R12 airtime and received a further R12 extra airtime. I made a short call which was deducted from my combo bundle, while R0.03 was deducted from the extra airtime. The remaining R11.97 is now also missing.. On trying to contact customer care, I was told that I could only chat to their bot, which is unable to handle my query. This problems has occurred previously, where I was refunded the airtime I had used, but lost the extra airtime value, also R50, and now another R61. Has anyone else experienced this problem?