Unfortunately you've reached an age where they aren't likely salvageable. You can try massaging them and posting them, but at this point the cartilage is most likely already hardened. Crops are usually recommended at the 10 WEEK mark to give the ear time to heal before the cartilage solidifies. If your vet was willing to crop at 7 months, you should probably look for a new vet as it is unethical to crop a 7 month old dog without medical reasons.
"i can explain it to you, but i can't understand it for you."