Bad Business Conduct

Good day I had my mothers car taken for polishing and mike was the consultant.He then advised me my mother that he wants to also clean the engine and my mom told him no.But he insisted and convinced her that they do clean engines for all NTT pre owned car,as she was referred to you by NTT Motors for her Polo VW TSI.Now the car comes back and the radio is not working after cleaning the engine and they don't want to take accountability besides being arrogant and telling her that they don't know what happened and can't do anything.Is this how you guys run business?If my mother's car is not fixed in the next 48 hours.I will make sure you guys trend for your ineffective bad business you doing there.You guys are now ****mers yourself because you outsource to these people.I hope I get fast rapid response or we will take it the law way and you have so many loopholes.