For 2023? Has your return been Accepted yet? If it is rejected you can leave and go somewhere else. If your return is Accepted you have to wait until the IRS finish processing it and you get the first refund. Then you can file an Amended 1040X return.
But you need to figure out why you should get more. You would have to compare both returns line by line to see what's different. The other tax place might be wrong and just trying to get your business.
