I want to close the account. Now!

During lockdown my husband (ID number ***) paid his Jet account in full via EFT. About four months later he gets a call from Jet that his account is in arrears and he owes them R150. He then started looking through accounts and saw that he was being charged R30 each month simply to keep the account open, no services rendered. Two years ago he wanted to close the account but the lady in store convinced him not to do it because, she said, if he didn't owe anything on the account there wouldn't be any charges. So since realising that he is being charged for nothing each month he has been trying to close the account. He went into the Matlosana Mall store over a weekend to close the account and was told that they couldn't close accounts over weekends. So he went in again on a week day and wanted to pay the account in full and close it. He was told that they would send him a final statement of account via email which he could then pay and the account would be closed. That was more then two weeks ago, he still hasn't received anything from them. He has tried calling the customer care number numerous times but nobody answers. He keeps getting calls from Jet call center and when he answers the phone they say hello and hangs up. He went into another store at Tyger Valley and paid the account in full but the account is still open so will soon have even more charges for zero service. How do we close this account??!