Putrid Service at MTNSA

Rating is one star because there is no zero. Mtn SA your service is putrid. I have spoken to Lindi, Nomzamo, Tshidi, Linda and was promised Annie would call me. Four days later, she still has yet to get her head out of her behind and dignify the promise with a call. I have 400 mtn to mtn minutes and 10000 anytime minutes. A month ago l got a free R30 voucher from Pick n Pay which l loaded. To my biggest regret because MTN is pulling underhanded tactics to milk me. I've had this contract almost 2 years and have never loaded airtime and could call any provider, using 10k minutes. Now l have to load airtime to make calls to other providers. Bu!!****. The above mentioned can see the madness cos l only loaded airtime a month ago, in two years. How was l able to make calls to other providers without the annoying recording commands me to load 'airtime'. They can see on my billing that l am making calls from my minutes to other providers. No mtn to mtn restrictions. Can someone at MTNSA with the aptitude, kindly remove the restriction. This is extremely aggravating and killing my business. My contract is almost over and this doesn't auger well for retention. Please assist ASAP.