Very disappointed

Hi im very disappointed with pick n pay smart shopper and BP rewards card they are running a promo for every 500 u fill till u fill four times u get a limited edition car. I fill for the first time no sms came and I phone customer service they said they will escalate the problem within 24 or 72 hours nothing happen I phoned three times uphill so I got fed up I fill again for 500 which I fill every week just to get the car. From the time they told they going to escalate the problem I've been filling 300 n 200 breaking it up cos of that issue. I've been a loyal customer from the time I got my car I've been always filling at BP garage and I think I deserve it to get the full collection cos all the garages here in verulam don't have stock especially Waterloo BP they forever saying they never receive stock. As loyal customer I deserve to get this matter sorted and get whole collection for all the troubles they put me through