Discovery insure lies to people!

The people that sell car insurance from discovery insure are ****s. They told me that I’d get 50% cash back on fuel spend and that was the selling point of the insurance only to find out that I need to have other products with them for me to receive this deal. I called them last week trying to cancel the insurance and I was sent from pillar to post without any assistance. Today they decide that they will assist me and I was told that the debit order can’t be cancelled since it needs to be cancelled 5 days before (why were they not helping me last week so we don’t get to this point?). This is inconveniencing me financially because no one is taking accountability, no one is doing anything and where must I get extra money to cover for this lie. On top of things no one confirmed with me that my insurance would be cancelled or not just “we can’t stop the debit order since it has to be cancelled 5 days before the billing date “ . What must I do with this information when I’m not in the wrong and when I called you since last week?