Debt Busters

I terminated my account with Debt busters beginning April 2020 and received confirmation from Debt busters thereof. So May month no debit went off but come June 25th Debt busters debits my account. immediately I email Debt busters and I receive a response that my bank account was debited in error. My challenge then started. Despite follow up emails and whatsapp chats no team leader or manager got in touch with ad promised. Debt Busters also does not allow walk in visitors during lockdown. If my money which is R1 858.35 was debited in error, why does it take this long for someone to call me and why not credit my bank account immediately. Is something amiss????