Car promotion

We have used the Smart Shopper card and filled up with petrol 4 times. We are awaiting the unique code to redeam points for a car. The code we were sent was invalid and not accepted at the garage. We raised a query with Smart Shopper and BP, promised an escalation and response. Not received anything We have continued to fill up at BP. We are now waiting for another unique code. has not arrived. Clearly there is a big problem with this promotion. How and when will this be resoved, and those deserving people get the cars that were advertised?