Looking for someone to fix my established websites Joomla online ticket system

I have a website that has run great for 5 years. I sell online tickets for bars concerts on the website. All of sudden a couple of days ago, the were problems with the online ticketing system. When everything was working good, People would order a ticket, then they would be automatically directed to PayPal, where they would then make the payment. After the payment they would receive and automatic email from my site with a PDF that had a ticket for the nights show. From my end, when the ticket was purchased, that person would automatically appear on the guest list with the amount of tickets purchased for the show. This does not happen anymore. I tried a system backup restore to the day where everything was working fine, but that did not work. Now people will buy a ticket, they won't receive the ticket by email and the persons name will not appear on the guest list. I am looking for someone to fix this problem so that it goes back to the way that it was. My number is 1-416-433-1545 and my email is linsmoretavern@[login to view URL] It is important that this is fixed ASAP, as I have a number of shows running currently.