Always the same problem ! I am really fed up!

It is the third time that all my waypoints have been deleted without any reason. It is also the third time that my character’s attributes have been changed to negative values.
I really don’t want to start again the game for the fourth time considering I have reached the 63rd level with the sorceress. Is there anyone who can kindly suggest me what can I do?
Is there anyone of Blizzard who can restore my character attributes and waypoints?
Thank you in advance for your suggestions.