If there was a noise by-law that would help.
As well, if they are doing the drilling after hours or too early in the morning there would be a by law for that so I suggest you call back to confirm that they cannot help with the noise level or the hours.
If not then you have to treat this as a civil matter.
You have a right to peaceful enjoyment of your home and your are being deprived of this right.
Noise is considered a nuisance just the way something like second hand smoke would be.
A nuisance is a tort which is a civil wrongdoing.
So you can sue the company for causing you this disturbance.
Your first step would be to have a lawyer demand that they either cease and desist from disturbing you or provide you with adequate compensation to cover all the time you have been and will be deprived of the right to peaceful enjoyment of your home.
Does that help as a starting point?
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