Opinions on Sales Ultimatums

Have recently experimented a little bit with going through with ultimatums (whether it be on initial outreach or on the close) and have had varying levels of success. This includes:

• Simply not discounting in certain situations (company is big and can afford it) despite our prices being designed to be negotiated upon
• For smaller companies: discount by a certain date or we won't give a discount any more --> and following through
• Asking people straight up if they are not interested if they are being iffy on the demo (checking their phone, texting etc.)
• Telling people after multiple follow ups over email that this will be my last email
• Calling people multiple times and after multiple bins telling them I will never call them again if they hang up on me this time (this one has had really crazy levels of reaction, both good and bad)

For my company (and to my knowledge, most companies), this is not usual, but I'm getting tired of the delays and don't really feel like wasting my time. I don't really care if people do not respect me or they hate my product, just tell it to my face and move on. No more games please!

Wonder others' opinions on this or if ya'll just keep playing the game...