Settlement Amount Results in double Debit Order

Good Day

I have 3 Contracts on Cell and have been a loyal Member for years, on December i requested a settlement amount for 2 if not 1 account , which was my laptop to be Closed off due to financial constraints and affordability, the stllement anount amounted to R1 383.00 which i paid off on the 4th of January 2020 a few days later i called their retentions department and sent emails for a settlement letter and this time around were to as responsive like before when i requested the settlement amount. and today i received an email with an invoice of R1751.01 i want this matter resolved ASAP as to why . I have been waiting for thier call ever since and i am always told that the matter has been escalated.

Regards

Angry Customer