Harassments for loan that has been paid

I had an account with Capitec Bank and had a personal loan with them, I lost my job in December 2020 and was unable to pay the loan which I was advised I was covered for but was not but in May 2022 I was able to settle the loan even after I settled my loan I was still getting calls to pay the loan which I advised was paid and they were harassing me and they cut the call and I even received a letter of confirmation it was paid yet still receive calls from them and went into the branch to close my account thinking it would help but yet still get calls from them and they cut the call when I answer probably realizing that they made a mistake and till this day I received spam calls from which I advised they, consultant, that I no longer want any communication from them.