OLX is not relieble

Hi

I'm Mr Sidelo from Queenstown I bought a TV on OLX. The person who is selling this Tv is Brian Mtshali from JHB .I gave this guy all my details which are : my residential address , first name and surname and my ID number.I first asked him what are you going to do with those he said its a proof that the TV is going to be collected by me ,all I have to do is to bring my Id and proof of residency when I'm going to collect it .I paid this guy R 1780.00 via mobile banking for a TV which was advertised at a price of R1500.00 , the extra R280 was for transportation for of the TV . This guy decide To increase the price up to R2500.00 so I said to him I'm no longer interested he must send back my cash and he denied.His cell number is ********** 014 / ********** 446. My Question is when you sell something to OLX do they verify that you are selling something genuine ? or do they take the full details of the seller to avoid such things not to happen .for me OLX is not relieble.