Cancellation of purchase order

is there any agreement for the business ?. If so follow the agreement terms. or else choose other option to sell it. 

Sir,

We were issued Purchase orders for all the values from the client. They have same in there records and we have proof of mails for same too. Its a company we were dealing with and every thing was on paper not verbal.

PO terms were 

Delivery

"Dispatch of consignment within 30 days from the date of purchase order failing which the consignment will be liable for rejection or suitable penalty would levied and no claims from supplier would be entertained by us whatsoever in this regard.

" Warranty

One year from the date of Supply.

Terms of Payment

The payment would be released after 30 days from the date of submission of invoice..

Terms of Delivery The material should be properly wrapped and packed with Bubble sheets and corrugated paper alogn with foam corner guards to ensure no damages during transport time. Necessary images are mandatory to be shared by the supplier to us, before placing the consignment in the vehicle. Wooden crates packing would be advised in case of fragile items/consignment unless otherwise specified. Shipping Instructions As above