The short answer
A buyer of goods has a reasonable time to inspect and may reject goods that do not conform to the contract. After accepting, a buyer can revoke acceptance only if the defect substantially impairs the goods’ value.
Where it fits in your case
When delivered goods are defective, late, incomplete, or damaged.
What to expect
Timely notice. Rejection must come within a reasonable time with notice to the seller, and specific defects should be identified.
Seller’s cure. A seller may have a right to fix the problem within the contract time or a reasonable period.
Partial acceptance. A buyer can accept some commercial units and reject others.
Installments can be rejected only if the defect substantially impairs that installment; cancelling the whole contract requires impairment of the whole.
Transit damage. Who bears the loss depends on the shipping terms.
What we need from you
The purchase order, shipping terms, inspection records, photos, and all notices to the seller.
Common misconceptions
“We used some of it, but we can still reject.” Use may count as acceptance.
“Asking for repairs is notice of breach.” It may not be enough.