Unable to reschedule the appointment with the technician

Hi,

I had an appointment with the technician today (10th Jan 8 to 10 AM) for the internet installation. However, because i was shifting my house i was not able to be there on time (reached the place at 9 AM).

I was asked to reschedule the appointment by the technician and i also received a mail with the reschedule link

However i am unable to schedule any appointment by clicking on the link as the link is not working.

Kindly help