Ban broadband companies from charging existing customers more than new customers

Existing customers on broadband are frequently overcharged when their existing contract comes to an end. Often they will have to waste time phoning up sales people to try and negotiate a lower price. These companies are exploiting the fact that most people don't want to go through the hassle of phoning to overcharge them. All of the wasted time on these phone calls and switching providers is a drain on productivity that only benefits the broadband companies and exploits vulnerable people.