False debit date

Before activating my services I’ve asked the agent when is the first debit order going off, I was told “end of January 2018” on the 3rd of January I was debited, didn’t go though because I was under the impression my debit order will be for the end of January.

You can’t say the debit is the end of January but then debit on the 3rd of the month which is not right.