automatic promotions

We have found over the past couple of months that promotions have automatically been added, 10% … with normal rates. Does anyone know how to stop automatic promotions?

Our small family-run B&B sells the rooms for the same price at every platform. Because of these automatic promotions, now there is unfair competition and we are getting a lot of complaints on our clients.

We never gave permission for these automatic promotions. So how is Booking allowed to do this?