Hello,
Sorry to hear that, if you're unable to buy champions from the store section, please go to the "Collections" tab near the Loot tab and enable "Show unowned champions" and buy champions from there. There's currently some problems with riot's servers and that's the best fix we've found so far.
“Had a boosting with Stathis ( jungler ), oh man having a jungler just feels insane, great guy overall, always positive and trying to win even in unwinnable games that we end up winning somehow.”
“Purchase was very easy, good price, and the 20k blue essence as well as a bunch of champion shards was great to purchase the champions I wanted as well as a name change.”
“I worked with Tony and he was awesome, extremely timely, communicating very well and performed a duo match with me to make me part of the process of earning my rank rather than just sitting back passively. Prior to him, I was hardstuck ping ponging between G1 and G2 despite knowing I was better than the competition but didn’t have the right teammates which is crucial as a jungle main — strongly recommended”
