I want to download Truecaller

Many people are calling from numbers I don't know. They don't want to text before calling. In one day, there were 20 calls. So please block the numbers so they can't call anymore. Also, use Truecaller to find out their names even if you only have their numbers. There is a premium feature to find out the location of the callers. This is to avoid spam and scams. Thank you.