I had a problem with that emergency cover a couple of years ago - I thought I was paying for repairs but it turned out that all they would do was stop the leak the quickest (ie cheapest) way possible. My water tank burst and all they would do was tie that ballcock up so it wouldn't fill up anymore. I cancelled the policy and wrote a letter of complaint - I never got a reply but the cheeky so and so's keep phoning up to say my cover has lapsed and would I like to renew it!
Good luck, hope you get it sorted out soon
Claire xx