You know those data brokers and skip tracers like Acxiom and Epsilon that merge all the government databases like property records or USPS change of address notifications with private databases like all the contact lists every random app wants you to upload?
They probably did a fuzzy merge and your number (or a number typo'd to yours) got associated with some random old lady.
That's how I got on the lists of all the scummy PACs targeting elderly voters that Adam Bonica called out recently. I only figured it out because the cash for homes cold contacts trying to lowball his house will actually respond.