Keeps calling but won't leave a message

Caller: Energy something

SO annoying, every day so far. When you call back, you get a really loud fake style ringing sound, before a pause then connected to obviously overseas. Said I was not interested, stop calling me. They called again the next day on another number! Very similar except the last digit was a 2 - Grrrrrr

Energy company, really rude wouldn't take no for an answer. Wanted me to compare my electricity provider and offering me 43% discount. When I said I wasn't interested. He told me to just listen to him I'm trying to save you money, What is wrong with me? Offfttt F*#K OFF... im done with these arseholes calling and being rude. BLOCKED...!!!!