Billed over R6000 again

Last year around May MTN billed me over R6000 and for the following couple of months they kept on billing me outrageous amounts. I fought so long and hard with complaints on Hello Peter that received responses such as \you used the data so you got charged for it\", I hope that this woman felt like an A-hole as it turned out I never used the data, yet they only credited half of the account after I already paid as they threatened me. This morning I woke up to a wonderful bill of R6166.20, just for interest sake, my account should be only R304. The funniest thing of all is that this sim card has not been used in ages as we had a Telkom line installed for uncapped Wi-Fi. I am so tired of this that I really want to cancel my accounts with MTN and have them carry the cost of it all. They have taken food out of my families mouths for months on end last year and now they want to do it again."