Washing soda will raise your T/A, Borax will not. Ask them to get it.

Washing soda is soda ash and T/A goes up with it.

What I would do if you are stuck is LOWER pH to 7.2 (if it's not lower).

Then AERATE your water to raise your pH without raising your T/A. In fact, this may be the BEST way to raise it.

If you have a vinyl pool, T/A of 120 gives you lots of room--you can go to 180 safely. But if you have concrete/plaster, you don't want to raise T/A.

Another way you can raise pH is chlorinate with Cal-Hypo--assuming your calcium level is low enough to tolerate more calcium.