Raised debit note. Should i receive Credit note from supplier?

dear all

for defective goods we have raised purchase return invoice (taxed) and sent back those defective goods to supplier

do I have to receive CN for the same?

in the same above case, if the supplier rejects or inform to change rates of some items, after one month (after filing 3B) do we need to amend the debit note? or wht should be done if any change in particular inv