A releasing agency that does not receive a letter under § 828.005, 828.006, or 828.007 before the expiration of the seventh day after the sterilization completion date agreed to under § 828.002 shall cause a complaint to be filed against the new owner. It is a presumption under this law that the failure of the new owner to deliver to the releasing agency a signed letter as required under § 828.005, 828.006, or 828.007 is the result of the new owner’s refusal to have the adopted animal sterilized. The new owner may rebut this presumption at the time of the hearing with the proof required under the above-mentioned sections.