Ok, i ll do my best to put whoever reads this in situation:
A few years ago i started playing this game. i reached level 16 and then I stopped playing until today.

When i logged in I pressed the "BATTLE" button and i found a foe to fight. When it started, I attacked, but the foe didn t replied. At first i thought he was AFK (away from keyboard) but after 5 battles happening the same i think this is not true, there might be a bug or something.

Please help, i loved this game and i don't want to end it this way.

Something more like a lag happens to me from time to time
It is really a pain bc I get "frozen" for entire turns - that when not for the entire remaining battle
Isn't that what's happening to you?

Missing too many updates causes an account to mess up (can't think how else to put it xD). Unfortunately this can't be fixed, so the best thing to do is to start a new account.

Might sound like a pain, but with so many updates all your parts will be obsolete anyway. On top of this leveling up now gives tokens which you would miss out on too. In the end you'll actually benefit from making a new account rather than trying to get your old one to work again.

I hope this doesn't sound off-topic, but on the matter of new accounts... can the Support Team "cancel" an old account so I can use the same e-mail in a new account?

Deleting an account isn't possible. However you can change your email in the Use Control Panel. After that you should be able to use the email you want for the new account.