Bunch of ****mers

My account was debited on the 13 of February 2026 that was fine and was the amount we agreed.Today I was surprised that same amount is debited and I did not authorise any other debit order this is a one month loan When I contact them they saying this is interest but I'm asking why did they not debit everything last month .Now they saying they won't reference Nd me my account is up to date .my question is if they are cancelling the debit order they will debit again cause they do that every month