my landline is dead. Chat doesn't connect either.

Help! I've had my landline set up OK here since Dec., but it has gone dead. The online tests say that everything is OK on their end. A few days ago, my internet connection was dead, but now it's back on. I'm concerned that will happen again. When I click on 'Chat', nothing happens-- that seems dead also. I'm not technical, have no clue, cannot reach help at Infinity. What should I do next?