Tenant

I was having a tenant. He was a fraud and was run away from my house from last 1.5 years locking his tenanted house by doing frauds with many people. I ask him to vacant my house on phone but he keep on fooling me by saying we will come in a month, week or so.. he stop paying rent as well..one day he call me and agreed to vacant my house by sending a letter duly signed by him..in that letter he requested me to transfer his house material to one of my godown and promise me to come within a year and settle all dues..on his written request i transfer his house material and take possession of my house. Next day his wife along with a lawyer come and make sceen in front of my house and try to prove that letter a false and my there police contacts they file FIR of robbery, theft.. police had taken my neighbours statement that his material is not stolen, it is shifted to other place in the presence of many people..now its 2 years gone and police had not filled any chargesheet neither they are interested in any thing... now how can i cancell this FIR that is a black spot on my status..tenant is still missing and his material is with me. He is demanding rupees to take his Fir back..please tell me what is the procedure to cancell it..and how long a police will take to file chargesheet..