Came to get CVT transmission oil for my 2015 Honda...

Came to get CVT transmission oil for my 2015 Honda Accord, guy at the parts department told me that for that year the it took Honda CVT fluid only so I believed him, he also said for a fluid change it required 3 quarts. So I got home, changed the fluid, and the transmission instantly started slipping. After doing more research I found out that it was supposed to take HCF-2 fluid and 4 quarts not 3, turns out the guy lied to us and now we have to change the transmission and it only had 15,000 miles on it.