False Advertising & Poor Customer Service

I bought a REPLAY-10 MAXXIM IGT Swarm 5.5 from these guys back in July. The velocity was rated on the product page of their website as 286 m/s / 938 fps and when I received it I was quite disappointed to see that the actual velocity rating on the side of the product packaging is 220 m/s / 722 fps.. I have emailed them multiple times since to ask the actual velocity of another product I am interested in but they are ignoring my emails.