Kzn fuels damaging vehicles engines

My vehicle went for a service not too long ago. I have done just over 4000km after that. My EPC light has come On. I have been advised that this had been reported by numerous people and it's a common occurrence due to the fuel supp**** to the motorists is the KZN region. They have advised that we should use Engen fuels based on a survey and if this fuel is not used the Maintenance and warranty would not cover the claims. This type of information has not been published to the any of the media but is being enforced by VW Ballito specifically. If there is anyone else reading this that can assist to investigate and get more clarity on this, it would be most helpful to all our motorists in the KZN area. If this is true, we would appreciate it if they do escalate this to the media and these companies reassess the relative franchises and have their fuels tested for compliance. It's owe to use as consumers