Cancel challenge that have not started

Question

So, a bug made me challenge a low level players as many times as the limit.
Now, I don't feel like playing against the same person everytime and I can only queue as many challenges as I have completed the old ones.
I am just clicking submit for every answer to clear my challenges. ><
I need to be able to cancel them, please, just like we can decline when we are challenged, we should be able to cancel challenges we proposed but have not yet started.

Answer 1

Maybe you must to write to SL or wait them expire