Sorry... that doesn't sound like a "certification"... just sounds like some roofers vague opinion and there doesn't seem to be any warranty included in that. Nowhere does it say "if the roof doesn't last 5-7 years... we'll repair it... blah, blah, blah".
Sounds like you're stuck.
We would agree with John, that your first order of business should be to bring the roofer back to stop the leaking and find out what he plans to do to correct the problem.
Unfortunately, the standard response seems to apply....your best position may be supported by seeking some legal advice.
The certificate that was provided to me says below:
Name of roofing company,
Addressed to Previous home owner,
As per your request we have done an intensive inspection of the roof at (Home Address).
We have come up with few minor repairs that needed to be done. Flashed chimneys, replaced pipe boots and replaced few missing shingles.
Now that these repairs are completed, we feel the roof has a life expectancy of 5-7 years before complete roof replacement will be needed.
Signature of the roofer.
You tried to avoid what you know you needed to do and you got nicked. Replace the roof and stop finding someone else to blame for your mistake.
But all your answers will be in that certification. I doubt, very seriously, that his 'certification' includes paying for some other roofer, to replace the roof.
I would guess that he was 'certifying' his REPAIRS for 3-5 years... whaddya bet?
I would contact the roofer that gave the certification and made the repairs and have them come and take a look at the situation and discuss your options.
I have found that in todays market and world.. almost everyone feels that new a new ___________ should be installed. I would call the previous roofer, but lose the "go after" portion of the conversation and see what they have to say since you have the certification from them.
Let us kinow how it goes!