Stupid telkom systems

I have been trying numerous times on different days to decrease spending limit... Instead it allows me to increase.... Tried to contact call center was holding on to long.... Tried again today same thing phoned call center after holding for over 30 minutes from 3 different phones finally a Bongeka answers just to be put on hold and then be told sorry mam can you phone back tomorrow as I am unable to decrease only allow her also to increase. I don't have time and energy to call telkom all the time and as a result of me being unable to decrease the limit my son used the spending limit to the max which I am liable to pay now cause telkom will not take responsibility I need this sorted asap please