Nimble Collection Services what a joke!

How unprofessional can a company be?????? I have NEVER seen this in my entire life. I cancelled Multichoice DSTV but as the dates fell I still owed them part of the month which is the amount of R 654. I paid the amount on 12 March 2021. My goodness since then I have been phoned by them on a daily basis asking me for the money. The more I say it has been paid they must update their records the more they say they will escalate the matter. I phoned DSTV plenty of times who has confirmed that the account has been settled and the funds have been received. I have send the proof of payment on various occasions by email & whatsup but they keep on phoning me. I want to block the number but with an unorganized set up like this I will most probably be blacklisted without reason. Yesterday I spoke to Waseema Hoedermaker and have send the proof of payment to her once again. She promised to sort it out. This morning someone phoned me and AGAIN asked for payment!!! CAN SOMEONE PLEASE ASSIST to get this matter sorted????????? Goodness can it be so difficult!