Jet2

how to pay fro extra legroom and not get it !

I bought flights to lanzarote and decided to pay extra for extra legroom. On the way out, brilliant, on the way back, disastrous ! The RHS of the forward cabin were just normal pitch, useless.
Cock and bull excuses about configuration changes of the aircraft takes away half of the extra legroom. AND JET2 were still selling extra legroom at check in according to the ticker. So it was a flight of two halves for me. Going out great, coming home, a nightmare. I'm not sure of the legality of changing an aircraft's configuration after selling extra legroom which now doesn't exist but as far as I'm concerned it's an absolute disgrace. It's all very well giving a refund but i need the extra space and because I'd booked and payed for it I should have got it. BEWARE of promises !