Pathetic service.

So...more than 5 years back I had a 24months contract on a IPAD for my daughter, after the 24 months I stopped the debit order, three months later they call me to say that I am in arrears, I corrected them and revered to the 24 month contract that expired three months back only to find out now 4 years later they blacklisted me on a outstanding balance of 0.00 but the status show that I am in arrears. I am struggling now for four weeks to get a letter from them to say that the account is paid up and I don't own them a cent, I visited the Vodacom shop weekly where they contact the legal department, every time they ask for my email address and promise me I will get the letter with in 4 to 5 working days........ still waiting......If I read the other complaint I cant understand why the people still make use of a business like this that only concentrate on sales but the after sales service goes for a load full of S@#t.