"Repairs" done didn't work

I had a leak in my roof and I contacted Willie from Buildster to come and fix it. I proposed he raised the roof to increase the slope after wich he said it would not be necessary and that seeling it would do the job. He proceeded to seal the roof but it was still leaking. He tried to reseal it but it stil didn't work. After waiting 2 weeks of trying to get hold of him he told me that a bigger job would be required and i would have to pay for it again.