That's not quick support at all with over a week's turnaround.
What I would call quick support would be anyone answering to my support tickets within 24 hours of me posting them. Also they should have a strong presence on social media platforms and answer questions there when needed.
So while kucoin may be average or decent in terms of speed, and they certainly have at least attended to your issue, they are not fast by any means.
The fastest right now could be binance, I haven't heard any major complaints about their support speeds.