Still getting harrased

I have a Fnb Smart Spend loan handed over to Brooks&Luyt. Received an sms last week Wednesday 10 February 2021 for a settlement discount. Borrowed the money from my employer and arranged to pay back my employer. Paid the money the same day on the 10th and the sms said it was valid untlil 12th. Now a week later I have still not received a paid up letter. The account is still open with the outstanding balance that needs to be written off as the discount. EVERYDAY I am still receiving phone calls from Brooks&Luyt. Getting told they will update the system and will not receive calls anymore. Just to still receive a call the following day. Jeesh really how hard can it be??? Why do you offer these discounts if you cannot even do a proper job with it. This is really pathetic and very bad and poor service. All over the internet is bad reviews