Phone call of 3 Mins

I got a phone call from a representative asking for some phone/call plan from a renowned service provider in my country. Strangely though.when I denied to ask me to hold up to 3 minutes as that's requirement from his recruiter to conseder successful marketing call. I denied but he insisted and by that 3 minutes got over and he hung up. Now sure something is wrong, What could he be doing "Sim Cloning?". Note that no personal information shared over call, Not even name.