Assistance allocating fun to my name

I’ve been with telkom since 2017, I went through a rough patch and missed a few payments. I then got an email that I need to settle the amount I owed them. I made a payment on the 4th of April 2024 into Nudebt management to settle my @Telkom acc, I made a mistake with my reference and have been struggling to get them to allocate the funds to my name since. I have emailed and called and even went to the branch but I haven’t not been assisted. @telkom please assist