Double debit on policy

After 2 emails to union life premium collections and 5 calls to union life regarding a double debit, i still have not received any assistance. i changed my baking details somewhere between the 16th and the 18th of February but on the 24th and the 26th they debited both the old and newly accounts. I sent an email regarding the double debit but i still have not been attended to. today the last call center agent i spoke to told me that i should obtain a bank statement, even though their system clearly shows the 2 debit orders went off, i must now go to the bank pay R13.00 per page for a bank statement to correct their mistake. in my opinion this is day light ******* and it appears i will not get assistance regarding my query but they will continue to freely debit my account.