I don't think there really is anything you can do outside of disputing the appraised value. The bank knows you're not going to make up that $62,000 difference with a down a payment and you can't finance the house for more than what it appraises for so the bank's only option is to reduce the price and they apparently think it's worth more than your appraisal. You can not "make" the bank sell the home for less just because the appraisal came in low.
If you and your agent think the home is worth more you can provide additional comparable sales and dispute the appraised value.
Depending on how the appraisal was ordered, you can try the VA SAR or staff appraisal reviewer.
The only other option I can think of is to change lenders and have another appraisal ordered.