Cutoff internet despite payment made

I was disconnected and put into arrears when my payment was made on time. There is even a record of the payment on the website. I was unable to find any contact details on the website and when I tried to contact support through the website it said that every street address I put (whether my own, a street that I know or one that I chose at random) was an invalid street address, I don't even understand how that is possible.

I have been using their services for approximately a year and I have always made payments. I have never had such problems with any other service provider in my life