Regarding UC Merced,EECS PhD Fall 2021 admission decision

[Anonymous_PhD_Applicant]

After a discussion over email, a professor encouraged me to apply and I've submitted the application by the priority deadline (15th Dec) at the UC Merced, EECS PhD program. After application submission, he interviewed me on the 2nd week of January 2021. At the end of the interview, he was positive to accept me in his lab and told me the offer will be sent by February 2nd week. However, still, I didn't receive any decision and the professor not replying my emails. What should I do in this situation? Should I approach another professor? Any suggestion?