With in-game mail that has now gone out to all affected players, we have refunded the cost of skill purchases that were made on Monday, November 9 between 1:17 p.m. PST and 2:17 p.m. PST (8:17-9:17 a.m. on November 10 AEDT) when the WoW: Forever servers experienced issues that caused some players to lose training they purchased.
If you were affected by this issue during that timeframe, check your in-game mail for gold equaling the cost of training that you purchased and lost.
Thank you very much for your patience and understanding.