Very rude and false information sent to me

Just called your call center now to load airtime and data. A nice friendly consultant loaded them for me with no fuss. I am highly upset that I have suddenly received an SMS stating "Yello, this is a reminder that you have exceeded your Credit Limit of R 1500.00 Your services have now been suspended for outgoing calls. Kind Regards, MTNSA". I called 808 to ask what is going on and Louise seemed to enjoy the siund of her own voice alot more than actually listening to my concern. She kept talking over me instead of listening to my concern which is extremely rude. I've worked in an international call center for 5 years; I know customer service. Please give that lady more training or take her rude opinionated self off the phone.