Useless MTN

Again was threatened by MTN by a Eileen van Wyk from the credit department as MtN, fater i paid an amount agreed upon woth Mtn they suspended my account now for a week and i cant do any business and they said they wont reconnect me untill my account is paid in full and this after i made an arrangement with them that was accepted, can someome from higher management ease assist here as i am being treated unfairly and will go public, social and to the ombudsman is not sorted asap