eThekwini Municipality dont pay back moneys owed

Why do I need to wait almost 3 months for eThekwini Municipality to pay back my deposit and fees after I have sold the the property with letter and documents as proof in Jan 2022 .I have launched miltipal correspondence with all the nessasery documents already in Jan 2022 only to find they billing me again and say the correspondence is in progress or resolved with no emails or even a phone call to me and still no money in my bank account they owe me more than R4000 no use phoning they dont answer their phones . CSM*** / CSM*** / CSM*** / CSM*** / CMS*** / CMS*** / CSM***