House insurance (building and contents). How can I get my £70 ?

ask: "House insurance (building and contents). How can I get my £70 ?"

I asked for a quote on the net for Buildings and Contents Insurance. They promised £70 Cashback if they could not match my existing policy. They are more expensive. Have requested my £70....... but E mailes are returned as "undeliverable". What do I do next ? This must happen lots of times. Help please.

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