CAR SERVICE CITY HOLDING MY CAR in for RANSOM

I will NEVER ever Take my Car to Car Service city - It was suppose to be a normal service of R2400 which We paid- Then they picked up all these other components to be fixed which came to 10k . When I now want to fetch MY CAR , They are Holding MY CAR RANSOM on some invalid reason that My funds FIRST need to reflect before they can hand over my vehicle - proof of payment is not sufficient with them - What kind of business are they operating ? In addition , they then want to charge you R150 PER DAY STORAGE FEES while your Vehicle is there - It's atrocious - DAY LIGHT ******* - and NOW they REFUSE TO HAND ME OVER MY CAR even AFTER PAYING - NEVER EVER EVER AGAIN - HORRIBLE service