Missing mount mechanospider, crimson/onyx mechanospider

I tried to contact support but they send me here to make bugreport. My account had 3 mounts that was reward for creating teambuilder team: mechanospider and its 2 variations, onyx +crimson. I even had this mount choosen for some champions but after game starts i have default horse instead and after game it sets horse for that champion. I would like for someone to help me recover missing mounts.
Still missing after several maintenances