If they call to ‘Ask what they can do to keep you’ or ‘Find out how they can do better’ just hang up. They have no decency, and nothing they say should sway you to give your money to companies that treat you like garbage

Don’t hang up, tell them. Tell them “I’m switching because you jacked up prices beyond what’s reasonable.” If they offer to lower prices, say “no, it’s too late. I don’t want to be with a company that takes advantage of loyal customers in the first place.”