I believe with some tanks you can replace the 510 pin, but don't ask me I have no clue how to do this. Sorry your new vape purchase isn't working out, but the good news is, if it's the tank, it's probably easier to find an inexpensive replacement than with the mod.... Although you may not end up with the same tank, you can do some research into what you might like and find something that works as well or better for less $$. I don't know if a B&M near you might be able to help with the 510 pin on the tank, it's possible, you might call around and ask...
Best of luck,
Anna