APPALLING SERVICE!...AGAIN!

I went into the Centurion branch of Mtn, at the end of November 2015, to sort out an account problem I am experiencing, I had to arrange for payment on an obscene amount that Mtn has charged me with, my first payment was made and we asked that the store log the request for a payment arrangement as to avoid suspension of my account, as per usual Mtn centurion NEVER even lodged the request and simply proceeded to remove the payment I just made (R1000) from the big amount they say I owe and did nothing further, I had to return on the 7th of December 2015 to try and sort out the issue!, Firstly: they made me fill out a ridiculous form with my details on, then they made me wait for approximately half an hour while they helped other people who came in after me. Secondly: they only had two cashiers working on a bench made for 5!, eventually I left that store, as I was pressed for time, I find this Rather appalling and absolutely ridiculous, Horrid Service MTN SA!!!