Ridiculous increases in premiums

Ridiculous increases in premiums. After I claimed for my cell phone I phoned to have the new phone registered as an item under my All Risk items. It is EXACTLY the same make and model phone than the one I had insured on my policy before. Yet the premium went up MORE THAN DOUBLE. I appealed this amount and was referred. I was promised a call back on Monday 10 June with a follow up to my appeal/request, and well of course today is Friday and they still have not phoned me back. As always, poor customer service from Momentum...