In addition, do be aware that nickname services have nothing to do with mIRC, it's best to ask this kind of question in the network's #Help channel as they may have information that we don't know (for example, if the mail servers are being attacked etc.)
If Services recently when down or were lagged your email may even be 'forgotten' by Services and not come. You might want to contact an IRC Operator to get your email resent or wait for your nick to expire (usually 1-3 days) and re-register.
Regards,