Ford Sucks

I took my vehicle to Ford Lazarus for service, received the vehicle back with engine light on, ford refuses to fix the problem they created. Ford Lazarus wants me to pay for multiple check on the vehicle at my own cost and reason for engine light is the catalytic converter and because i use 93, never has Ford told me not to use 93 and the cost to repairs was R10 000, reported it to ford SA with no assistance 2 years ago, still driving around with engine light started the process again and found out the cost to repairs is now R20 000 and Ford SA will on assist with 50% of the labour. Thanks Ford for being my best friend when purchasing my vehicle until you had to fix your problem.