phone THIEF in 4e1

dear 4e1,
as you all know my phone has been stolen by someone in class on thursday during the eng lsp. i tried getting my phone back on friday, but to no avail.
this is all i've to say to the thief :
my parents are going to make a police report on tuesday night, that's when i get my bill. from there, i'll know who has called me and the police -who has been informed- will be able to trace you down using my phone's gps system. a total of 7 calls were made to my phone from the time my phone was stolen to the time it was turned off. those 7 calls are more than enough to locate your whereabouts.
however, if you return my phone to me by monday by leaving it under my table, i will call off the investigation and cease pursuing this matter any further.
I therefore seek your understanding and hope you return my phone, it has a lot of sentimental value to me. furthermore, you are from 4e1 as well and i do not wish to start suspicion among our fellow classmates. i say this because the police will have to interrogate everyone in 4e1 to find the thief (so they'll have further proof to back up their findings through the gps system).
i hope i've gotten through to your conscience and that you will return my phone on monday, so as to avoid unnecessary complications come tuesday.

thankyou