This week I took the trouble to check and recalculate the Cumulus points credited. And lo and behold, out of 5 purchases, the additional points from promotions (1 x with 20x coupon, 1 x general 20x promotion) were not credited in two cases - a pretty high error rate... Since hardly anyone regularly recalculates the point credits, Migros is probably "saving" millions of points in this way ?