mortage calculations

Sorry if this is in the wrong place but I would like to get a bit of advice from people who understand mortage calculations etc.

I have a mortgage in Spain and have beome aware recently that I have a "floor Clause" in the contract which has apparently been ruled illegal in a lot of cases. My solicietor has approached the bank but they are unwilling to do anything so it would need to go to court. Costs would be about 3k and solicitor says 90% chance of winning though there is no retrospection of what you have overpaid. I want to know if it is worth doing based on the figures

Mortage taken out 1/3/2008 dud to finish in 1/3/2033. Amount left on mortgage is 82,932.
Currently pay 5.3% and will be paying this over lifetime if eurobar stays 1.3% below this. Basically I pay a floor clause of 4% plus spread of 1.3% a bit like a tracker plus 2.3% costs 521 per month roughly
If I won the case I would be paying the eurobar plus 1.3%. How much would I save and is it worth doing?

Current monthly euribor is 0.224% .Is this the rate your mortgage is based on?
If so,it looks like you are paying 3.8% over the odds.This would be >3k this year and maybe 30k over the life of the mortgage.

Can you afford to pay the €3k if you lose? That is probably more important - if you can then the odds are the only consideration and while a loss would be painful it wouldn't be ruinous. If you can't afford it without borrowing then the odds are not your first consideration.

Is there any chance of refinancing the mortgage at a lower rate for a lower outlay than the 3k?

Thanks Vandriver and Socrates for the replies. I don't have the money to do it but if it saves enough over the long term then will see what I can do. Don't know about refinancing at a lower rate - Spanish banks are hard to deal with.