If you are able to do simple jobs on your own car, maybe consider leaving the official servicing to once every two years, but replace the oil and filter "in between" always using SEAT(VW Group) sourced oil filter and a approved high quality engine oil.
That is what I did with my 2011 Audi S4 as stupid Audi dealer had left that car on variable long servicing - it came to me at 12.5K miles and just over 2 years old, and I only use it very longer journeys so maybe currently running 3.5K miles a year (what a waste of a car?)
Now that it is out of extended warranty I do all the servicing and that is done every 12 months.