Discounts on context in Yandex and Runner

It turns out that contextual advertising services are really fighting dumping.
Today a letter came:

The Begun company deprives accreditation and stops working with the Ara advertising agency, Moscow, in connection with the violation of the Dealer Agreement by the latter.
We remind you that according to clause 3.1 of Appendix 1 of the Dealer Agreement, the Dealer does not have the right to provide his customers with discounts on clicks and impressions in the "Runner" system.
Providing discounts to their customers leads to increased unhealthy competition between Dealers, which reduces market prices and deprives both Dealers and Begun of profits.

Yandex also removed them from the list of accredited agencies, but did not disseminate press releases of official statements.