GP ULT UPGRADE?

so i was fighting another gp when i wasn't able to upgrade my ult but he did, i was trying to understand why by talking to the other GP about it. but it didn't get me anywhere more like his team calling me a noob, build better farm more and other stuff. i had over 600ss and was not able to get what i want ,is there something im missing? i dont get it, was it a bug? plz riot or someone help thx