Useless african bank

i had a loan with these people, which on the 25th January 2018 i settled in full, i have all the documents. the following day they debit my account which i reversed. now for 8 months ,each and every day the bug me at work, stating the same thing over and over that i owe them money, to which i have emailed them 5 times all the documents, showing that i paid them, IN FULL. i took them to the ombudsman, which gave them 20 days to respond and they did nothing, it was then escalated to 15 days, and they still have not done anything, besides the daily phone call to tell me i owe them money. for 8 months i have had to take time out of work to drive back and forth to the bank, costing me petrol and reversal fee's. Are there no attorneys out there who are willing to assist me, i have an airtight case against them, and now seek considerable compensation from them for 8 months worth of hassles, i have had enough of putting up with their uselessness and theft.if anyone can offer me any sort of advice it would be greatly appreciated.