"bad" petrol and service

Contacted the help line who put me on to ********** on 22/10: Please pass this on to whoever deals with these matters. My car and my Brother-in-law’s car started giving trouble shortly after putting petrol in at Shell Wadrif Garage on 14 October 2017. I filled up with 93 at the outermost island- he (cc’d on this mail) put in 95 at the next island closer to the cash office. I find this unacceptable that my Audi A3 should pre-ignite as a result of using Shell fuel. Now that I put in decent fuel, the pre-ignition has gone. His car(Chev), would not perform at all as a result of putting in Shell petrol (95). I would be happy to provide proof.

An automated response was received: Thank you for contacting Shell Customer Operations South Africa A dedicated Customer Operations Specialist will respond to your request within 24 hours. If you would like to enquire about the status of an order, request a copy invoice or statement, please make use of Shell Markethub at www.markethub.shell.com To view a short introduction video to Shell Markethub click here

No substantial response was received - They apparently don't care that they re delivering gunk into consumers vehicles.