VODACOM AND VVM

I'm very disappointed with vodacom l bought a contract phone in 2020,l finish paying for the phone and l received a call from VVM saying l have been blacklisted and l have to pay R440 and l paid it but l made a mistake on a reference l put I ***9 instead of I*** so VVM called back they say they did so the money but l have to send proof of payment l send them several times still again they say l have to pay R440