Hi, I’m Louie. Sorry you had to wait awhile but I’ll do my best to help.
Initially, bear with us; re-confirm and post back with the complete model number of the "...Vetech handset..."
Can you please try 10 hrs of continuous charging of the new battery / handset? (as prescribed by the User's Manual)
The "...s 6419..." would be the system / base unit model number. The handset would have a different model number.
Still, my participation is strictly limited to technical, repair and/or installation issues.
On the "...don't want to pay...cancel and refund..." and other billing & payment concerns, contact Customer Service to have this taken cared of prior to any / all other interactions.
As posted above, contact Customer Service to have this taken cared of prior to any / all other interactions.