How do you deal with veigar?
I'm new and I main Support. Everytime i play against a veigar my team gets shit on and theres nothing i can do last game we could not push without losing 2 ppl to kill 1 veigar sometimes he just wiped the entire team slowly also the speed he can push a tower is just stupid. Theres nothing i could build to keep me alive from his burst except a GA. So my question is how the fuck do you deal with him

is quite squishy, and he would prefer to stay alive to unleash his combo but has to get kinda close. That's why in a teamfight a team would typically focus either him or their ADC first, depending on who is more dangerous at the moment, and your cc would make taking him out much easier on your teammates.