MBD stop harassing me

I don’t owe Vodacom anything. MBD promised me this matter will be resolved, that was over a year a ago and now I’m recieving threats from MBD. I opened a contract with Vodacom 2018 June and it ended in 2020 June. The last payment I ever made was R2000 in June 2020. I had 24 months contract with Vodacom. I spoke to a lady a year ago, her name was Shirley. She said I should go to the police station and get an affidavit and my 3 months statement. Which I did, I followed up with no response. This very frustrating because I don’t understand why I’m still owing Vodacom after my contract has expired with them.