BP Pick n Pay ******* promotional campaigns

The BP (Pick n Pay) 100 Limited Edition collectable campaign - Ready. Set. Collect all 4 cars is the biggest **** ever! In the terms & conditions, which was written in letters 1mm high, there is a t&c that says you can only collect a maximum of 4 cars! None of the BP service stations that I filled up at, after having claimed my 4th car, was aware of this! Even when I phoned in a number of times, did anyone tell me this! Only on the last day of being able to redeem the car, I got a reply email telling me this! I would have used my wife's Pick n Pay card had I known this!