1 TON of air conditioning requires 400 cubic feet per minute of air movement in the average HVAC system.
So in order to have a quick Fitbit contact customer support, you just need to punch these numbers, 877-623-4997 on your XOLO (X900) phone. So it means you should not be facing any problem in speaking to Fitbit's customer service representatives.
Firstly you should track your package and find out the most up-to-date info about it, which is provided with official Fedex parcels database. If there no any new info for a long time, you should contact Fedex customer service at 1.800.GoFedEx (1.800.463.3339), they can find a solution for this problem.