Incessant calls from mycelldeals

I got an SMS about an offer for a cell phone contract and i agreed. Immediately i became disinterested in the product and told them through the phone that i'm no longer interested in the product. They initially called me from this number ***. Then they called me 25 times on the 29 Oct 2021 at an interval of 5 minutes for the whole day using different numbers. I found that very disrespecting, demeaning and very unprofessional . May you please get them to stop calling me as i indicated my disinterest in the product.