Failing to honour the contract

Since I joined Liberty I've experienced nothing but pain having to reverse debit orders which reflect negatively on my credit profile I specifically told them they should debit on the 26th or 25th of every month however every single time I have to reverse a debit order cause they deducted before the agreed date on the contract last time I was told somebody captured the information incorrectly which I understood I still went and reversed it and now today again I see a debit order of Liberty Life going off from my account yet we agreed that it should be on the 25th and I also made manual payment on this account on the 8th already why are they still debiting my account after agreeing on the 26th of every single month what type of an investment company that fails to honour the contract agreed date which is the 26th I do not expect such incompetence from such a big company is it too much to ask for I said 26th not 13th or 1st of every month