African Bank constant calling

In 2019 I went into debt review, and 2 accounts from African Bank was added to the review. I paid my account to review company diligently every month. Unfortunately I was retrenched by October 2020 and have been unemployed since. I still paid the account to the review Co. Now my money ran out and I could not. What bothers me now is that I have been receiving numerous calls from African Bank for non payment of account. I have sent through proof that I was retrenched to the review company. Still African Bank is calling me even telling me that I have made an arrangement to pay them, which I did not and would not. I keep on informing them to call the review company, but African Bank still calls me..... This must stop. Times are stressful enough being unemployed and not finding work. And not being able to even put food on the table or being able to buy any other stuff. I have other accounts at other institutions which is also part of the review and they not even calling me. Stop this African bank now.