You need to find out who, besides you, is the distributor of the plant.
Then find out what volumes are dispensed by distributors.
I agree with Vadim that the scheme can be very simple:
A distributor from another region buys a shipment of goods, much more than you, while the selling price is reduced. Part of the goods is transferred to the affiliate company for sale, at a price lower than yours. As a result, there is a gradual displacement of you from the market by dumping policy, and the separation of the client (buyer) to equal shares.
Two options are possible further:
1. An affiliate company raises prices to yours and receives a certain fixed income, since the sales market is and is divided approximately equally.
2. Forcing you out from the places of sale by renegotiating supply contracts with legal entities, and organizing your places of sale near yours, force to forcibly lose a client, which means a decrease in profitability and .......
To prevent the above, it is advisable to take measures to establish the place of delivery (legal entity) and check your competitor as a legal entity. faces. But right away I’ll tell myself to crank it all up will be problematic.