Highly Angered for over charge

Hi All, I have had a terrible experience with motor spares shop in Pietermaritzburg. I was referred to Autoquip Motor Spares (owner Ritesh Hanuman) by an acquaintance, and therefore accepted the referral. Prior to Autoquip Motor Spares collecting the vehicle from my yard and taking it to the workshop for repairs I had explained everything to the owner. He showed concern and full understanding of the situation and agreed to quote me prior doing any work on the vehicle as I was not able to pay a huge amount of money for the repairs. I would've brought it back home instead. That been discussed he installed an engine management system, new battery, repaired 3 tyres, consumables and labour, put in a sensor or 2 and made a few modifications and after R30,286.00 without any proof and an invoice only given for 1 payment of R16786, later the engine is mixing oil and water, this value excludes the towing of the vehicle plus a new radiator fitted. I humbly request that these guys should be stopped dead in their tracks by this message being posted on every social media platform to avoid this happening to innocent people out there who earn an honest living and are being cheated and robbed. They refused for me to make a payment arrangement and held my car in storage until I got the police involved and had to pay the full amount without any proof of what repairs or parts were done on my vehicle. Please repost immediately.