Ill mannered agent and not adhering to our agreement

I got an sms on the 18/04/2018 which is today's date regarding a debit order that didn't go through. I spoke to one of your useless agents who gave me an attitude and didn't seem interested in wanting to assist me because he was in a hurry trying to end the call and didn't want to resolve my query. I got a call from your people selling me a product which I agreed too, and I stated clearly when the debit order must go off, so why on earth was there a split payment? then you send me an email that if anything happens to my vehicle I won't be covered?? whose problem is that? why are there terms and conditions in the first place and why would you ask me for a date on when to debit if you won't abide to my instructions? I don't need such problems in my life because of your stupid agents who fail to do one simple thing. The guy (idiot) I spoke to just now didn't have the patience and therefore I asked to speak to his manager, he put me on hold then hung up. Is this the **** I signed up for? I believe all your calls are recorded and you better listen to the agreement I had with the lady that sold me your product and when the debit order must go off, and I want you to check your records again with the useless trash I spoke to this morning who decided to hang up on me. I'll be waiting for your call!!!