Discount not updated

I am very disappointed with Nimble group.I spoke to Nomsa on 11 July 2023 requested a discount she advised me that her supervisor approved 30% discount when I asked for the discount in writing she said I don't have to worry about that as she will make notes I immediately did a EFT and sent POP the following day she called me to tell me head office will send a paid up letter which till today I have not received and when I check on the Nimble App I still have an outstanding balance. I explained to Nomsa that I will be using money meant for my mother's funeral to settle the account I buried my mother yesterday I am still receiving calls that I am still owing. I am very disappointed. Please resolve urgently.