MBD POOR SERVICE

I got a call with a discount to settle my account, which i took and paid in 24 hours. However its been over a month and i have asked for a paid up letter with no assistance. Every Time u contact customer service u get promised that the letter was requested and u will receive it in 48 hours - this was on 3 occassions already. when u query why its taking so long - the consultant puts the phone down, i have been calling every day and receiving the same responses and service. this is unacceptable as u make a payment and then there is no service after. added to this i have checked my account on the portal and it does not show my discounted amount - the discount appears as total due? all i need is my paid up letter and for my account to be updated.