SIR Appeal

<p>I made a major mistake by quickly deciding to say "No" to my admission offer to UCR over UCSB. But now I want to go to UCR. Is it possible for the UCR admissions office to reset my SIR so that I can say "Yes". I have already contacted the office and left a message. Please do you know if resetting the SIR is possible?
I found out that I have to submit a SIR Appeal. Am I more likely to have my appeal granted since it is not like an admissions appeal which is harder?</p>