vrot service AGAIN!!!!!

i took a contract with fonechoice November 2013, which gave me endless problems and eventually it was fixed. about a month or 2 ago one of their agents called me to offer me an upgrade and that the tablet on offer is much better than the one that i had and that the deduction will go off end of February. i just called the call centre to complain that my account was double deducted, i spoke to an utterly rude woman by the name of Asanda who did not even give me the time of day to explain why i am calling. the more im trying to explain that one her colleagues said that its an upgrade on my old tablet, the more she was going on about, whatever she was going on about, because i still dont know. clearly have no sense of customer care and telephone etiquette.