Your cheapest option is to dismount the upholstery of the seat and review the NTC wiring.
NTC is the temperature sensor installed at the heated mat (where you are sitted, not the backrest) Also you could buy new NTC at a 'Electronic Stuff Store' and swap it.
The expensive way is to buy a brand new upholstery for your car and again change it from your old one.
Regards.
PS:
If you dont have leather, the heated mat is glued to the sponge of the seat.
If you have leather, the heated mat is installed inside the leather upholstery
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