Hi Jewels,
It seems that the number you called at is correct …did you try to email them at care(at)ososleep(dot)com? Or … did you leave a message with your phone number and name as they instruct on the answering message?
OSO used to be one of the trusted members of our site. You can see some of my previous comments about their mattress in Post #2 here or by doing a forum search on OSO Sleep.
I would be curious to know if they got in touch with you.
Pheoenix