Hi

Please assist me, I need help. My husband and I own a small mechanical workshop. 

A client had dropped off their vehicle with us, 7 months ago, only paying a deposit of R3000. 

Their complete job was 13000,they wer supposed to pay 8000 before we could start, as we needed to buy dpsres and send vehicle to engineers. 

Car came to us in June 2019,client was contacted to pay the balance, so we could start with work. 

They only came in December paying 3500 more. 

We purchased spares, and sent the engine to engineers. The client now felt that they wanted the car done immediately, and pressured the engineers and us to get the car running as soon as possible, after the engine was done, we had to put up our own cash to get it back from engineers. When we called the client and asked if they had the full amount to pay and pick up their vehicle, as we now put our money in it, they said yes. 

Vehicle is now up and running and the client does not want to pay, they want to take the vehicle first and pay on account. But we have refused, when we call them to pay, they become aggressive and say they have no money. 

Csn we legally go to court, to scrap the vehicle off their name, and sell it to defray cost incurred. 

It's now 8 months and we are at a loss. 

How do we go about this?

And what is our legal right?