AEG SANTO integrated Fridge Freezer Repair

I've AEG SANTO Integrated Fridge Freezer. Freezer is working fine but the Fridge is showing +21 degrees and is not cooling down to the desired temperature of +5 degrees. I've tried powering down the fridge freezer for many hours and tried restarting it but it doesn't work. I need someone to fix the fridge. I need a fixed price no fix no fee type quote.