UNHAPPY CUSTOMER RE ARREARS ACCOUNT - NOT MY FAULT!!!

I have dealt with Christopher Makholwa who assisted me in April with a quote on extended warranty on my car. I accepted the charges etc, he advised me my 1st debit will go off on 1st May'18, which I agreed to. After a few days in May I phoned him again as n debit went off, he then advised that his accounts department could not load my policy in time & my debit will go on 1st June'18 which it did. Only to find out last week after I phoned Liquid Capital as there was problems with debit orders on their side that my account is in arrears, to my shock the lady Wendy advised that my 1st debit order 1st May is in arrears! Nobody bothered to phone me and tell me this. And after Christopher advised my policy will be from 1st June '18! Wendy even confirmed that, say I had to claim now, I will not be covered as my policy is in arrears....... and it is not even my fault. every month my debit order goes through hassle free on my side. I want this resolved or I am canceling my policy with Liquid Capital.