A week ago i registered for clickbank affiliate account, selected a product to promote and got two sales, now i found that the first product sold got refunded, so can someone sugget me is their any limit of chargeback/ refund issues after which clickbank suspends/blocks the account, Or any reason which may result in getting my account blocked?
No, You don't need to worry about. The chargebacks are affected for only Seller account. Their is no problem with your side.