Took out a contract with Sky Business about 18 months ago. A few initial problems to get up and running. Since then, broadband and phone line service has been, at best, ok. Although there have been some occasions where there has been no broadband, meaning we cannot take card payments.
The monthly invoice that you can download via your account with them is very poor and a nightmare if you need to print it out.
However, we have not even been able to download copies of the last 2 monthly bills (August & September). Every time you try to download it, up comes a message "Whoops, there's been an error. Sorry but we are having technical difficulties. Unfortunately, we have not been able to process your request".
Called them last week to explain that I had been attempting this for a number of days, getting the same response each time and asking when they were going to resolve the issue. Was told allow 1 week. That has now passed, but nothing has changed. PATHETIC!
I don't actually believe they are doing anything about it. They take their money via direct debit and that's all they are interested in. Can't wait for the contract to end!

UPDATE -
Since my original post, I have spoken with both their Customer Service (in India) who promised faithfully to call me back with an update within 72 hours - this never happened, of course - and their Complaints Dept (who, on the first occasion, just transferred back to their Customer Services) who confirmed that they were having "technical issues" but could not give me any assurances as to when these would be resolved.
It is now 6 weeks since I first found that I could not download a copy of their invoice and nothing has changed! Either they are not trying to resolve the issue, or they are just totally incompetent!