Unprofessional service

I had a account that was handed over to MBD . I have requested a settlement letter which they were very eager to email me. Payment was done. Proof of payment was sent to Constance Thokoane. Up until today I have been calling and holding on for 45 minutes until eventually I hang up. Constance is not replying to my emails. They send me sms to say my account needs to be settled otherwise they will take further action. How *********** . Surely the money is showing in their account with my reference. They are a bunch of ****** highly unprofessional for a law firm I would say. If I don't get my settlement letter today . I will be the one taking further action!!!