Reg host matching

Hello all, Recently I was interviewed by Uber and HR called me and told that I got selected and will get offer letter by 2 days . After 2 days HR calls me and tells that headcount for the team is full and she will forward my profile to different teams. I didn’t hear anything from her till now ( assuming that this is holiday season, I understand the delay) . I have another offer from Salesforce and the joining date is approaching. This offer is very good in terms of compensation and position. Should I postpone the joining date for few more weeks At Salesforce so that I can wait till I get offer letter from Uber, did any one got the same reply from Uber? I thought there is no host matching concept in Uber, Any inputs would be highly appreciated.