Change of address

Good day for 2 years i rented the property and the previous tenant stayed at this address moved. No forward address was communicated with her service providers. Ever since they moved their mail is still delivered at our address. It seems that they are bad payers and does not pay their dept. I wanted to provide African Bank with the new address of the person and they obviously does not want their money back because the lady I spoke to on the 28 July 2015 said she cannot do anything. So if someone at African Bank is interested in getting back R39 000 please sent or call me for the new address.