Illegitimately done over

On the 10th August 2019 I gave a mandate to my so called friend to represent me with his documentation like bank statement and others into renting to buy a bakkie Nissan NP200 model 2013 Reg#CW_05_VF_GP at the Boksburg area of East Rand Mall. This was due to the fact that I have been struggling consolidating my bank statement after the Department I'm working for paid my salaries in bad faith starting from June-August of 2019. However, this I did so after a lengthy consultation with one of their sales ladies emanating from May as she promised would bear positive outcomes on my favor. However, an upfront payment of R15000 was required in order for them to release the car that I paid on the 1st August 2019. Indeed he did so successfully but to my demise he did not return with the car instead drove it around in our location of Mdantsane Township of East London. Up until I involved his parents that he did return the car on the 25th August 2019. I continued paying the car installments starting from 14th September 2019 for R5200 ever since up till the 15th November 2019. On the 20th November 2019 some two guys Arno and Lebogang pitched up at my workplace claiming they have been sent by the company that I have been paying the installments for the car at and that the so called my friend (Nyanisile Maxhobi) has actually instructed that company to come and collect the car as he does not need it anymore. They just showed me documentation that it's copies are on my possession. I have handed over the car keys after they called police on me lest alone my legal advisers telephonically advised me not to because they are supposed to come with a court order to collect their car. Now the ambiguous question I am left with is who is going to refund me my deposit back? Because a lady by the name of Mercia arrogantly told to deal with my so called friend about recovering my monies let alone they have been very happy to receive my deposit and recurring installments without questioning who's name or signature on the leasing contract. One positive bearing proof about is that I have been always doing their payments by EFT that appears in all of my banking statements. Kindly assist as I believe these people are taking consumers for a ride because the guys who came do collection job are also concerned the way this exercise is carried over because they also indicated a lady from Port Elizabeth was also done wrongly dealing with this collection exercise. These guys are *****ing over people that are consumers who cannot buy cars at the dealership. All the documentation is on my possessions. My contact details: ***; ***