This kind of thing has happened to me numerous times. I've blocked many numbers and it stopped for a while. Now starting again. Best bet, silence your phone and don't answer any number you don't recognize. Less likely to bother you if you don't answer.
Called twice today I have talked to them once. Told them I was not interested and not to call back. They just called again I did not answer. They asked about a loan.
They have called several times. Never leave a message. Answered once and they said I was approved for a loan. Never applied for a loan! They asked for my name and zip code. When I tried calling back the first time I got a recording saying it was Pay Day Loans. The second time I called it rang with No Answer. The ring tone also changed. Obviously a scam loan company