Threatening SMS sent from Revco Consulting

Aggressive sms sent claiming I should pay my tv lic but I have received no invoice or previous comms on this matter. Your what's app line has no human behind it and only seems geared to take money. You don't even provide a contact number. What must happen? No invoice sent but you threatening legal action??!! Get you **** together and be professional, send a ****** invoice if you want payment.