If you receive a lot of spam calls from a specific area code and prefix, you have the ability to block that. In the Hiya Android app, click on the three horizontal lines in the upper left to open the Navigation Drawer. Then click on call blocking. Click on the + symbol at the bottom right and you should be able to choose the option to block "Numbers that begin with." You can then input any area code and/or prefix that you might be having issues with.
Please be aware that the block option for will block all calls with the area code or area code and prefix. Even those in your contact list. If you are on the most updated version of the app you can unblock the contact after the fact.