Have I been missold a hire purchase?

I purchased a car on hire purchase. I went into the dealership and asked for a quote and was met with a pushy salesman as expected. The quote he presented me showed the net credit, monthly payments etc but failed to mention the finance charges anywhere on the quote sheet. Even the net credit I later worked out doesn’t include the finance charges. Without the finance charges, the figures looked fine to me so I agreed to purchase and I put down a deposit and signed the purchase invoice. I noticed at the bottom of the quote sheet it says “for illustration purposes only - not to be given to customer. This is not a customer quotation. Written details available on request.” I then asked by email for a copy of the pre contract credit information and finance agreement and I was told that I would be given a copy of both on collection of the car. When I went into collect, I was given the 2 to sign with the sales executive quickly skimming over details but I was not given a copy. On requesting this by email after the visit, I was told I would be sent a copy by the finance company. I have since noticed how large the finance charges are. Do I have a case to say I’ve been missold the finance product?