Contact
Email works best: it keeps the thread, and the person answering can look at the same numbers you are looking at.
Support
Product questions, billing, a number that looks off, anything about your account. A person reads every message, usually within one business day.
Privacy and legal
Data requests, deletion, the DPA, or anything about how your data is handled.
Kometrics is made by Fields Apps LTDA, a Brazilian company. The legal pages carry the formal details: Terms, Privacy and DPA. If you would rather see the product than write about it, the live demo is open.