How much of a hassle is it for you to change your email address - telling all your contacts, modifying details on websites (like PPRuNe, bank, ebay, PayPal...etc.), and changing business cards / stationery?
Balance that against how much hassle it is for you to deal with the nuisance.
Bear in mind that if you are changing email address, you might just as well change ISP - Freeserve seem to have been less than useless in looking at your problem.
SD