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Please fix my leaking roof

I have a leak in my roof that I"m looking to get fixed asap as it's already caused considerable damage to my ceiling, and it is dripping inside to such an extent that at the moment I'm just trying to prevent my carpet getting ruined too. Perhaps you are someone with some investigative skills who can identify the source of the leak? I have already had roofing guys out three times to "fix" the same leak, but there has been no improvement (actually it's worse) after them sealing tiles, and even replacing tiles. I'd be keen to hear from anyone who thinks they can help