Poor Service received and lack of mechanical knowledge

Do not use these Mechanics,as the damage my engine components,Johnny & Wally overcharged my battery ,damage my computer box , Ignition coil,all electronics components . Do not use these Mechanics,he changed his mobile number aswell , after I have sms how I am unhappy with his services . Mostly they advised their services on Gumtree.They charge me R5000.00 for my engine Assembly.Worst decision making using them , Johnny Mobile Mechanics