Not honoring the Audi Freeway Plan ... not to be trusted

I had a recurring gearbox issue with my 2016 Audi A3 1.8 TFSI. I took it into Lyndsay Saker while it was within the 3 year Freeway plan twice, but they only updated the gearbox firmware and didn't fix the underlying issue. The exact same issue came up again just after my plan expired and now they tell me a major part needs to be replaced at my expense. I complained, they promised to escalate to Audi nationally for a partial refund but never came back to me.