eGO-T should say either "ego-t" or "joyetech" on the side of the atomizer, if it doesn't have either then its an ego, not an ego-t. Except now that the eGO atomizers produced now will also say "joyetech". Confused yet?
Atomizers are a nightmare for all vendors. With SR, LR, HV, 3 types, countless colours you end up with a ton of stock. All the atomizers come in the same black boxes with or without checkmarks done by hand to identify them. Its hard enough to keep them all straight yourself let alone train new staff that may not use the products themselves.
Contract your vendor, if you can take a picture of the inside of the atomizer and send that with your email, as that helps clear the back and forth trying to identify the atomizer.
Volts are a different thread to Joyetech eGO/510 thread, so unless you have an adapter it won't work.