Airtime Advance overcharge

VODACOM I usually use the airtime advance services but I paid it off early April of which the standard amount of R150 was then available to use once again. Mid-April I recharged my account with R50 and instead of my airtime balance going up, the available airtime advance balance went up to R205. So now I had to buy airtime from advance because I have been trying to call customer care and I am not able to speak to a consultant. So now I have to use the airtime advance in order to make a call because it was urgent next thing it is saying I owe R173 in airtime advance. The numbers don't even make sense. Right now I just bought airtime again because I have been struggling to get assistance and obviously life must go on and I was hoping to solve the issue once the lockdown would be lifted but since it might be a while before that happens I have no choice but to come here and compain. The airtime advance that I can use is currently sitting at R51 and I owe R228 in airtime advance and the airitme that I have been buying from advance does not exceed R100.