Slow service,issue still not resolved

Issue still not resolved,over a week later Request for paid up letter Good day I have call MTN Friday 02.02.2018 as i was under debt review and need a letter showing my account is paid in full,i was then told i have an outstanding balance which i paid immediately and email proof of payment . On Monday the 05.02.2017 i called MTN again an another email was sent to there legal department to issue the letter that my Account is paid up with the proof of payment. 24hours has passed (there turn around time on quires) and i have still received nothing. I was given a number to which i was told is "legal dep",i ended up speaking to a lady called Melanie whom said they do not deal with MTN. Then i called again MTN- ''as we are not allow to contact the legal department ourselves,and got told we will follow up,but there ''nothing we can do'' This is poor service Still freaking waiting