Quick to take your money, after sales service non existent

Purchased the Artsy bag in 2015. I recently sold this bag, individual understandably would like a copy of receipt for authentication purposes. Called LV for requirements to obtain this. LV confirms record of purchase and stipulates requirements to be sent over email to obtain record of this transaction. All requirements sent, four emails over 6 days and still nothing. How long does it take to get after sales service from LV? Quite shocking coming from a luxury brand.