Fitbit has HORRIBLE customer service. I pre-ordere...

Fitbit has HORRIBLE customer service. I pre-ordered a Blaze back in February. When it came in, I realized that I ordered the wristband too large. I sent it back for an exchange of a smaller one. That was at the beginning of March. I have called FIVE times since then to check the status. It is now MAY and they are telling me that there is no way to confirm that it has arrived at the warehouse because I did not send them the Fedex tracking number. What is it going to take to get my exchange or my money back? And I only gave it one star because I couldn't post this without it. They don't even deserve one star.
AND I called and left a voicemail at the corporate office a month ago and they still haven't returned my call yet.