Need Advice please - loan refusal

street1

I check my credit report with Experian regulary and recently i was refused finance for a new car, unsure of why, I downloaded my report and have discovered that the Car garage have applied for finance to 5 diffrent lenders - this has obviously had a massive negative impact on my credit status. I signed a credit agreement with them for their finance so I expected a search from them directly to appear on my file - I was shocked to find 5 searches!!Are they allowed to try more lenders without my permission??? Is there anything I can do about it.. Obviously I am really angry but I am unsure of what I can do about it??