Just replaced faulty extension kit

Just replaced faulty extension kit and now the app says we can't complete your installation...reply to an email which I have done but still doesn't work. How do you talk to anyone at Tado? I have had one for a few years and afraid to say the customer support is dreadful.

Does anyone know how I can get this poxy thing working as we have no heating or hot water!!

Grateful for any help.

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