It is disappointing that your seats are showing signs of wear after such a short period of time and relatively low mileage. Unfortunately there is no easy fix. One option would be to replace the front seats, but a pair of new seats would likely be very expensive and sourcing a good quality pair of used seats may take a long time as you would want to find a pair in the right colour. Alternatively you could try an automotive upholsterer who could disassemble the seats and replace the worn foam, although this may still cost a few hundred pounds per seat.