Hi everyone

I just received a call from PBE regarding my islamic housing loan application. The banker said if he approves my loan, I must sign the offer letter by tomorrow. Otherwise, he will get penalty due to ISO issue/branch turnaround time. Is there such thing? Btw, he is the friend of my property agent. I am buying a subsale unit in Subang. My applications with other banks are still pending. Should i sign the offer letter now and back out later if I manage to get a better offer? Please advise.