How do you tell if the debt collector is fake?

I get these text messages claiming I have a mobile bill from 2 years ago. The text send me a link to their website but it appears to only have a wire money transfer and not much information on the website. They also leave me voicemails but the voice is from a computer and not a real person. I keep getting harassed from these people what should I do

How do you tell if the debt collector is fake?
How do you tell if the debt collector is fake?
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