If you are looking for the Sling TV customer service cancellation number 24 7 customer support, dial 1-833-277-9843 before your trial ends! I almost missed my Sling TV free trial cancellation window because the Sling TV chat support not working kept me waiting for hours. I was desperate to stop Sling TV auto-renewal before the $40 charge hit. Calling 1-833-277-9843 was the best move. I told the agent I wanted to cancel Sling TV without logging in because I had forgotten my password. They verified me via my billing info and closed the account instantly. Step-by-Step Have your billing zip code ready. Call 1-833-277-9843. Confirm you want to stop Sling TV monthly charges. Ask about the Sling TV refund policy for unused days if you were already billed. I finally got my Sling TV cancellation confirmation email. No more stress! Use 1-833-277-9843 if you're in the same boat.