Complaint - VMSA

After five years, VMSA has started sending SMS messages insisting that I settle my account with them. Find this very odd, as by right, I should not be receiving any form of communication from them, to request any monies owing to them, due to being under review since October 2015. I had noticed that the last installment paid to above institution was in May 2020. It is not my fault, that if the review company deemed it necessary that the last installment was May 2020, and whom ever is responsible for closing their books, and did not so, that the account has more than likely accrued some form of interest, for which I am now responsible? How does this work? There were other institutions, whereby the balance had become zero, and they're no longer receiving the usual installments (paid up), and I have not received any SMS messages from those companies. So, VMSA, can you please look into this matter, as I am not happy with the SMSs.