Several issues

HI im having several issues and im about to give up selling on here. Firstly I had some items that were delayed so i sent my buyers a message to explain the situation. It appears only some of them received the message which is not good. Secondly once the items were posted I created labels from ebay and they were given tracking numbers. Most of the buyers have not received these either. Now to top it all off when I lodged them through aus post 7 out of 15 couldn't be scanned as they were having issues. They did state on the back of the lodgement that they couldn't scan them. Now those 7 have disappeared and cannot be tracked. Doesn't even say that they were lodged. Australia post say they can't find them and because I didn't have insurance its tough luck. Im talking about 80.00 items. Now what do I do. I don't see the point in paying 6.95 for postage with tracking if they lose them anyway. Im kind of at my wits end now.