Milestone Rewards in Coliseum

I don’t seem to be receiving the Grek pieces for achieving the 20% milestone. Is there an issue? I haven’t moved from 100 pieces for a couple of days. I passed the 20% mark just now and I should have received 75 Grek pieces (25 for 10% and 50 for 20%) but my total pieces stayed at 100. Ally code 168-619-852.