Outsurance are going to debit me for a quoted amount on a car I do not own

I am buying a new car and asked for a quote from Outsurance as I have my current car insured with them. I got a better deal at a different insurer and wanted to cancel my current car insurance with Outsurance on the date of sale of said car. They in formed me that even though I never agreed on a policy with the new car and was just asking for a quote, they will still be debiting me on the day of purchase of the new car the monthly insurance premium. I will be paid back the money but only next month. I do not have the funds or budgeted to have money held by Outsurance with no warning. Please can someone help as I won't make it to the end of the month.