The hell car track customer service agents are putting me through is dark hell is hot

I Dont know who changed my email address on their system to some funny names which now I am worried some one has my information that was sent to the email I manage to get it changed boom following month now in may they sent debit order on the 15 will it was agreed to be on the 25 and it has gone off on the 25. I want to know how and who changed plus who is going to pay for bank charges . I didn't get answer fine then spoke to an agent who confirmed it was changed only to receive email next day regarding payment and guess what it was not updated as per the agent it is still on the 15 ok confirmation that is now changed done and I accepted debit check for 25 with additional charge. Now I woke up with debit order sent for 20th to be honest this has become annoying and frustrating how agents can lie and mess around they way they like on my account making changes. Who gets to be accountable for this mess.