EE don't operate a price-match policy. They tend to take pride in network quality which is not always matched elsewhere.
You con contact EE-CS and ask if they can offer you anything account-specific, but depending where that offer is from, they may well not do so.
Make sure you've tested any possible new provider in all the locations you'll be using your phone, to ensure their coverage & service meets your requirements. All networks are not the same!
