Activation of roaming without my concern***

November 2015 i went to MTN Wonderpark to upgrade my two daughters contracts and all was well until they visited the UK in December and one of the contracts belonging to my little daughter continued to work since i did not travel with them i wasn't aware of it until my eldest daughter received a message from MT<br> N stating that they have exceeded their credit limit that was in January. I contacted MTN to enquire about the SMS and my kids lines were suspended as a result. The lady by the name of Nola adviced me that i dont have to pay the amount onthe SMS it just mean that my kids has used up their credit limit then she activated them. To my suprise on the 1 February the amout of R1400 was debited off my account and called in to enquire they told me i have activated roaming therefore i must pay it. I logged a formal complaint with biling with no success, now they have debited R5600 which was unpaid when I call they refer me back to the store as they said i have activated roaming the day i was upgrading with which i did not. I have been thier client for more than a decade, I need this to be sorted with immediate effect. MTN no in question ***. I will continue to pay normal fees