Puzzle shake competition set up to make sure you do not win

The shake competition where you collect puzzle pieces is a ****, last night I got 10 mega shakes from re charging and 9 shakes gave me puzzle pieces of which none updated, the call center told me it is because I got the same puzzle pieces that I have already received The system randomly allocates the same puzzle pieces and then you do not get extra and the system randomly allocated the same puzzle pieces to me nine times in a row