I have been hitting my head against this wall lately, for context my niche is Roofers, but every cold call that I make or any intro call that I go on, people straight up refuse to even hear me out because they have been scammed or burned by other marketing companies who could not fulfill on their promises, I even tried with free trials just to get my foot in the door but to no avail, how can I get over this issue( I am trying to go for people in UK as all kind of ADS except google are kind of a blue ocean for roofers,facebook,yt or tiktok). Any advice would be helpfull, idk if volume can fix this one.

What do you use to run cold email, to scrape leads, to build websites / funnels, make invoices etc

Here in latam whatsapp is very common. My contact platform with clients is WhatsApp but now I have some clients and they´re talking to me every day at every moment (it´s my personal WhatsApp). Do you recommend I switch to Slack?