unknown people disturbing on facebook ?

[Lonely]

some unknown people sending me reqst ...
i m simply blocking them bt now a days they are making frnds with my friends...
my account is full private... (nothing is public.)
and messaging me through them..
(his telling my friends that i used to love him nd showing my friends fake messages bout me..) i don know that person ..!!(then how i will send text messages..!
how to get rid of this things plz help...
i hate this kinda annoying people...!!
any help
thankyou n advc..!?!?

dont tell me to close my account..(this is not a solution.)
y m gona close my account for a unknown people)??the guy is not in my friend list
he is anoying me throurgh my other facebook friends..
and ya i have evrything private..!!i have friends family...
some of them are in contact only for this facebook