Debit order reversal required

Good day

I am so frustrated as I have already logged a formal complaint with Liberty, but clearly nothing will happen because they have nothing to lose. You guys have done exactly what I requested you guys not to do. You took another debit order from my account for the month of March. The debit order for the month of March had already gone through on the 22nd February 2019. Please can you reverse the debit order you took from my account as the next debit order should be on the 1 April 2019 for the month of April. I am on maternity leave and will not be completing any documents as I do not have access to printing or scanning facilities.

Thank you