I bet they bought your info from data brokers and joined datasets. You probably leaked your phone number with your name at some point: maybe you filled out some

I bet they bought your info from data brokers and joined datasets. You probably leaked your phone number with your name at some point: maybe you filled out some form, put there your number and later this form was sold to data brokers. On another occasion you gave away the link between your number and that email: some furniture website asked for those details and you gave that. Another big opportunity for data hoarders is those in-store discounts in exchange for your number, but they also get to see your credit card info, so linking your number to your name is trivial.