Very poor services and ***********

I've upgraded my contract last December *** ,paying R540 for 2 which is what i have signed up for,MTN has been billing me twice for the same device ,I've called the customer service more than 5 times now ,spoke to Xolani,Tshepo,Nhlayi Sibani ,which they confirmed that i was billed twice for the same device and promised to escalate matter to the relevant department,References were sent so that i can do a follow up ***,***,guess what i called today spoke to Noluthando Zungu who just told me that my query was rejected cause it was log to a wrong department,no one cared to call me and advise or re log to the correct department,you guys are *********** and you don't respect your customers.