MTN Xtra Time ****

I have been an MTN subscriber for many years but recently I am quite unhappy with what I call day light ******* ,I have been using the Xtra time option that has been offered by MTN, When I started using Xtra time I would qualify R10 airtime I would usually take the whole amount offered to me and in return MTN would add an extra R1 meaning when I pay back I would have to pay R11 and over and above I would qualify for emergency xtra time to the value of R3 however this days I only qualify for emergency airtime of R3 I no longer have the option of taking R10 at once mind you with every R3 I get charged I have the call center but my issue has not been resolved this i quite disappointing for a Bozza Network or maybe MTN is a Bozza network in ******** it's subscribers.