Voxility has some very aggressive cold-sales department. They've approached me many times to sell their product.

I've ignored the first few mails. Still they kept coming.

I've told them curtly but politely we weren't interested. They tried to engage a sales conversation from that. Ignored them. Still they kept coming. Future outreach mails not even acknowledging the earlier conversation.

I told them they needed to learn when to let go and, literally, to "FUCK OFF". Still they kept coming.

I stopped their spamning with a custom SpamAssassin rule. That's what it took to get rid of them.

Don't support those spammy sales techniques. Don't do business with them.