Bad service from Auto and general under Nedbank

I have taken up home content with auto and general under Nedbank and years back electricity damaged my amplifier and auto and general replaced it recently after lots of rain and electricity failures the amplifier just stopped working I put on a claim the took the amplifier then they declined my claim saying amplifier is faulty or too old of which is the one they replaced the original 1 that I bought and told me it’s quality and now it’s 2 months without an amplifier no communication and they expect me to pay monthly premium every month so said how they gave me an amplifier that is not of the standard of the 1 they took from me