Any right of the purchaser to cancel the contract provided by this subsection is waived conclusively if not exercised in the manner required by this subsection.
In order to cancel a real estate contract when permitted by this section, the purchaser shall, within the time required above, give written notice to the owner or the owner's agent either by hand delivery or by depositing into the United States mail, postage prepaid, and properly addressed to the owner or the owner's agent. If the purchaser cancels a real estate contract in compliance with this subsection, the cancellation shall be without penalty to the purchaser, and the purchaser shall be entitled to a refund of any deposit the purchaser may have paid. Any rights of the purchaser to cancel or terminate the contract for reasons other than those set forth in this subsection are not affected by this subsection.
N.C. Gen. Stat. § 47E-5