Debit order date change and confirmation

Horrible, phone was dropped in my ear and they did not even all me back, I change my debit order date to the 25th monthly I called Liberty just to make sure that the next premium date will be the 25th of June, I even asked the satffmember that assisted me is he sure my next premium will be 25th June. Last night the debited me with the premium now they can not revers and I have to complete froms and wait for 7 days to get my premium back. I think this is very unreasonable of them after I called to get clarity that my premium will be June. Im a pensioner, now that expect me to get on a taxi go get the form printed complete the from pay for all that with the compies that I have to make and than email ti to them, this is going to cost me more than my monthly premium do they no consider this.