I have got an E-mail response from them (Travelsimshop.com).
It seems that they have unblocked my SIM.
But they say some strange thing;
"Your TravelSIM card was blocked cuz since may 2006 we didn't record any topups on your account on travelsimshop.com. Due to TravelSIM operator regulation your number should expire after 2 years in the moment you didn't topup your card." But according to the web page
"
When does the TravelSIM card and the credit expire? - Help Desk ",
They say "SIM card and credit will become invalid if the credit has not changed for 24 months."
In fact, from the last billed action with my SIM, 24 months have not yet passed.
It is really strange. Have thay made a mistake that they typed "CHANGED" where they should type "RECHARGED"?