iSupply new contract offer

Apricot70

I have a contract with iSupply for electricity which is due to expire in September. I have been contacted on Friday by the company trying to get me to sign up to a 12 month deal with is marginally better than the deal I'm on. I am suspicious as to why they are doing this. Would I be better off waiting until then end of the contract term? They have said it's a limited time offer and may not be available next week. Well that's the kind of pressure I won't cave in to. Any advice?