intimidating

Few days back I put one guy on rent for more than 1 month at a token money of 5000.
After 2 days he went to his home and did not come for 15-16 days.
Now he is asking for refund which I have given (half price).
But before this refund we had heated discussion on phone and after refund he has started treating me through WhatsApp chat. Please guide what should I do to get away with this situation.
He sent a girl for the refund.There were argument with her too.
Below is the message he had sent
" Oyee sun tune sj acha ni kia kl aaunga chd
Kl milio jrur wrna tere ghr main aata hu
Tune acha ni kia aj mere na hote huee
Ldki ko kya galia dera merse krta bt na
Itna ee hh kya ldki ko galia dera jo
Me: I have not abused anyone.
Jada angrej nt bn
Kl mil tu
Me: Moreover you have got the money why getting so angry
Jo jo tune aj bola kl krta hu terse br main
Money toh teko kl main ir deta hu
Jo tune meri dost ko galia di wo
Thda na chidungabteko main
Bs jo b hh kl chd milio tu
Me: I have not abused anyone you please behave and control your anger
Main kuch ni bolunga mere dad b main aenge kl fr krta hu bt terse
Or kya bolra tha tu intrested nai hh tu merse bt krne main toh main b koi intrested nai hh tu bt krne main or na tu koi modi hh bc jo terse bt krne ko trsunga main
Galia dera tha na jo meko teko btata hu subha main
Sun le milio jrur jada ignore kt jr sunra hh"