"see to it" is a perfectly valid phrase in written English. It is typically used to mean that you are responsible for ensuring that something gets done. For example: "I asked my assistant to see to it that the paperwork was filled out properly."
It's the responsibility of Congress to see to it that the country stays within its income.
See to it immediately.
I'll see to it personally".
Montgomery has helped him see to it.
I'll see to it immediately.
He said, "I'll see to it".
See to it, please, could you?
I'll see to it," she said.
See to it that You appreciate her.
And I will personally see to it".
That is all I can see to it.
Being a terminologist, I care about word choice. Ludwig simply helps me pick the best words for any translation. Five stars!
Maria Pia Montoro
Terminologist and Q/A Analyst @ Translation Centre for the Bodies of the European Union