is it my fault-plastic bottles coke with no gas!!!

ISOME AFRICAN MALE VISIT ME LAST TUESDAY TO REPLENISHED THE 11 2.25 LITERS PLASTIC COKE FOR ME BUT MENTIONED I NEEDED TO RETURN IT TO THE PLACE I BROUGHT IT. AND HE SAID SOME OF IT STILL DO HAVE GAS IN IT BUT IT DO HAVE SO LITTLE GAS IN IT, IF YOU ADD ICE TO YOUR COKE THE GAS DISAPPEARED VERY EASY. HE DID ONLY REFUNDED ME WITH 6 GLAS BOTTLES OF 1.25 L COKE AND SAID THAT HE HAD TO EXPLAINED THE MATTER TO HIS OFFICE WHY HE DID GAVE ME THE GLASS BOTTLES OF COKE. HE DID TOOK THE HALF FULL 11 BOTTLES COKE WITH HIM