Referred me to debt collection for copayment that was paid!

Medforum in Pretoria referred me to a debt collector for a copayment of R361.70 which I settled in November 2023. I even sent proof of payment. How the hell do you guys make such an error? Firstly your service was very bad ya'll discharging me in the middle of the night then this! No wonder your reviews notes that ya'll are like a public hospital.