Your only recourse would be to submit a ticket to support. They're not going to come to the forums looking for random posts like this.
If you submit a ticket, assuming that you did indeed have those units, they likely can tell you what they were spent on and possibly, depending on the specifics of the situation, reverse the purchase and return the units. But you won't get anywhere at all without submitting a ticket.
I haven't heard of a bug affecting units so the only likely situation is you spent the units without knowing like you click on some pop up thinking it's free rewards to claim them but actually it cost you units
bro didnt pull the champion he wanted