Gear damage at the traffic

now it has also caught me hello people gear damage at 90,000 km. had at my traffic bj. 2006 gear damage. my contract workshop granted without renault 20% kulanz at 3000,00€UR cost estimate. Renault granted 0000% because I had my oil changes carried out in no Renault workshop but at a competitor. Guys, what does a engine oil change have to do with the gearbox??? great is also that it is known at renault that the traffic gear is vulnerable. have another than with renault – customer department co-tacted and hoping for a little bit of kulanz with a not even 3 year old car. if I get an answer from bruel I write you the result it greets you nest