If any threat, express or implied, is made to any motor vehicle dealer, by any manufacturer, or wholesale distributor on authority of any manufacturer, to the effect that the manufacturer or wholesale distributor will discontinue to sell, or will terminate a contract to sell motor vehicles to the dealer unless the dealer finances the purchase or sale of motor vehicles only through a designated finance company or finance agency or class of persons, the threat so made shall be prima facie evidence of the fact that the manufacturer or wholesale distributor has sold, or intends to sell, motor vehicles, on the condition or with the agreement prohibited in §55-13-102.