VERY UNSATISFIED CUSTOMER

Good day. I have contacted MTN and nothing is happening, the shop here lodged a complaint but nobody from MTN comes back to us. The shop is helpful but the rest is useless. I have a contract that is on my mother's name, the past few months my airtime and data just keeps vanishing! They tell me it's because I call people and so on, but my airtime gets ****** during the night or when my phone is just lying there, not being used! The other complaint is that I have 2 other contract by MTN which is on my name, the one is a tablet and the other one we got because there was a special with a tv included. That tv contract's sim card has been lying in a phone, which is off, battery is not even charged, in my closet which I haven't used in about 2 months. Normally my 2 contract is R407 but this month they deducted R778, when I went to find out what's going on, he system showed that the phone was used for the internet for over R300! Which is impossible since that phone is off and not being used. I haven't gotten any feedback from MTN, and the people at our shop in Harrismith can only do what they can. I want to be refunded or my contract must be stopped immediately!