Rude and unprofessional

Good day, Who authorize communication sent to clients. SMS i just received...Continued failure to pay your Ackermans account will result in further proceedings. Please Pay x amount TODAY at your nearest store to stop this process....Continue to fail???? I have made payment every month and pay more than the statement amount....Stop what process???? Why assume I have not made any payments, before that rude SMS according to me I thought your Debtors departments is doing there job by allocating payments to the clients account. I think you should focus on your Debtors structure it is not working for years, and this is not my first or second time being accused of not paying.