VW Shying away from Responsibility by blatantly ignoring Me

Just being ignored by VW. My car was serviced by VW West Cape but after 2900 ks, it was jerking damaging the coils due to faulty plugs. VW could only offer me a service date for a week later, giving me no choice but to use another company. VW now tells me they do not rely on third party dealers' diagnosis and my plugs were not changed during the service. I guess the customer must change the plugs. It's a joke. They violate my right to repair showing blatant disregard to the Right to Repair act, acting with impunity and have just ignored my last email sent on 28 May 25.