Owing the scheme

I cancelled my membership due to affordability but before that i had downgraded to a cheaper option and owed the scheme 403 i made payment arrangements and a debit went through on the 22 of june. 2022 , my sister keeps getting sms’s that I will be blacklisted mind you i have never received any communication from you but instead sms are being sent to my sister . Reference number on the sms *** this is unacceptable Membership number *** cell no ***

Can you kindly assist me as soon as possible I cannot afford to have my credit profile messed up due to someone incompetence or failure to check if payment was made or not