@Daisy-3967 Thanks for reaching out. It looks like you are talking about service bus and not Azure bus service. Please confirm if my understanding is correct.
I have research and to renew the certificate, you need to change the change the time on your server to before the certificate expired date and then update the certificate, below article will help you to update/renew certificate.
http://www.harbar.net/articles/wfm3.aspx
https://social.technet.microsoft.com/Forums/en-US/a123f2c0-33af-4a56-9ffa-5a6296703ef9/problem-with-servicebus-certificate-error?forum=sharepointadmin