One breast bigger than the other - BEFORE & AFTER Breast Reduction surgery. What kind of revision surgery can be done to fix it?

I had a B/R?S in Feb. BEFORE the surgery, I TOLD the doctor that my left breast is bigger, and he had to take more out. After the surgery, I noticed the left one was still much bigger & heavier than the right one. He must have forgotten that my left one was bigger. I did relay my concerns to my doctor at my 3 mnth follow up.He said he could do some revisions but I 'd have to wait 1yr from surgery 4 breasts to settle & I would have to pay. What kind of revisions could he do?