My guess its a scam, asked me what phone I have and how much I'm currently paying for the plan, and it already seemed like it was sketchy (was also a bit difficult to understand/make out what they were saying). When I tried saying I was busy he was like 'oh what happened ma'am, this phone call is just for you.' So idk, was kinda sketche out and I closed the phone call to be safe.
They claim to be calling from a mobile phone service provider (couldn't understand what the name actually was, but I know it wasn't my provider) and they try to get you to upgrade an existing mobile, home phone, and internet plan. Even though you have no account with them. I'd say, that sounds like a scam.