Can any apps block numbers?

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Some backstory to let you all know what's going on, cause why not. My phone has been blowing up since 7am because someone is INSISTING they need to get in touch with their boyfriend 😩. I've had a major "dry spell" this year so I know I haven't even risked that situation happening to me. But good god. It's now 10am and I've ran out of block slots in my phone and phone bill account. I never answer an unknown number, but they refused to leave a VM and only texted me. When I blocked that number it started a chain reaction with different numbers calling me. I even spaced out my phone number back to the first number (I'm dyslexic with numbers, so I get it) hoping they would realize they have the wrong number, and that didn't work. They insisted they were "texting their boyfriend yesterday from this number" and threatening to call the police over a stolen phone 🙄. They also demanded to know my name. Most of my friends are out of the country or have their phones cut off right now, and my phone thinks "storage is almost full" if I just hold it wrong-- so most of my "texting" is snapchat messages. Please give me any suggestions if any apps can truly block phone numbers from calling and texting! I downloaded one but it still lets one ring go through on my end 😩. I'm sorry her boyfriend is an unloyal dog but I wanna sleep! Help!