The ISP should be willing to fix this for you in a matter of minutes.
Have recently moved into a new flat and it turns out our modem router is around 3 years old but we have one that was sent to us that is only 1 year old and probably better which i am wanting to install. BUT in the installation manual it states that we will need a username and password supplied by our ISP, which we dont have. Is this a problem? Any way to get around this? Thanks in advance