Jagex Unlawful ban, not living up to there own terms and conditions Cambridge United Kingdom

I have been playing the Jagex game Runescape for more then 4 years. 3 of those 4 years as a paying member. Suddenly Jagex bannen my account permanently because they were the opinion my accountname was offensive.
Maybe it was, that is not the issue and a matter of opinion.

The issue is, they allowed my account name for 4 years (and took my money for 3 years) and then, without any warning or offer to change it, they banned it.

All my appeals (throught there appeal system and by writing the numerous letters) where denied.

In their terms and condtions at the time was a statement that Jagex could change an accounts name if they thought it was offensive in any way.

When I finally had contact with someone that was willing to actual talk about this issue (after a few months and many, many automated responses), he/she told me that it was technically impossible to change an accounts name.
So why state in your terms and conditions that Jagex can change an accounts name if it's not possible at all?
The fact that it's not possible seems very strange anyway. I am an IT-expert myself and know something about databases etc. Either there system is rubish, or they just don't want to help me.

As a reply to this, I asked them to create a new account for me, and transfer all experience and accumulated items from the old banned account to the new one.

They could not do that either. Again: either they have a rubish system, or they simply don't want to help me.

Jagex, in my opinion, is so succesful that they don't care about unjust banning of faithful customers who paid a membership fee to them for years.

I hope someone with some legal knowlegde looks into this. Maybe a lawsuit against Jagex is possibel?

Captain p.
Tilburg
Netherlands