IPhone 6 battery replacement

I sent my iPhone 6 in for a new battery under there reduced scheme due to the slowing down scandal. Apple have received my phone but are now claiming that my phone won't accept a SIM card even though 10 minutes before I sent it off to them it was working fine when I backed it up. They are now wanting £260 to fix the problem. This is crazy as they have obviously done something to the phone. What are my rights here, anyone know?

Time to get away from Apple, I say just get Android if going to be that much of a hassle.

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