You may request your stats to be completely reseted in the respective topics on our forum. Stat reset clears all your previously recorded stats except the number of played games.
You may request your stats to be swapped from one account to another. Both of these accounts must be yours obviously. After such swap is completed your PSR and ladder stats from your first account are transferred to your second account. The number of games, warns and played games are kept unchanged on both of them.