I haven't had to deal with this problem personally, but here are a couple of good discussions of the various surgical options. From what you've said, it sounds as if your vet is recommending TECA (Total Ear Canal Ablation).
Total Ear Canal Ablation, used on end-stage ears.
Lateral Ear Resection, a more conservative surgery, for ears that aren't end-stage yet.
Total Ear Canal Ablation, used on end-stage ears.
Lateral Ear Resection, a more conservative surgery, for ears that aren't end-stage yet.