Cant access bill from my email link

I have tried to access a copy of my bill from my email sent from MTN for April 2015 and May 2015. I need the copy to claim back expense from my company. <br> When I click on the link the message appears \Site Being upgraded visit your nearest branch". I then attempted to visit my nearest branch at Cresta yesterday however after waiting 30 minutes to be served I walked out. I tried accessing the link again this morning and still same message of site being upgraded. I then tried to call the call centre to ask if they could help me and after hanging on for 15 minutes listening to the most irritating music ever I hung up. I am most irritated with MTN."""