Extremely untrustworthy agency

We have had a very unpleasant experience while dealing with the branch manager for Sidcup / Bexley. We have been looking for properties to buy in this region and found that the agency carries out the entire sale operation deceitfully. They try and create a bidding war amongst the people who are interested in a purchase. They conceal the highest bid and ask all bidders to keep raising the price till the end without revealing the price to owners. This blind bidding pattern is misleading the buyers and they end up offering much more than the evaluated price. The strategy is harmful for the market in general, leading to future fail in the sale process and wasting of people's valuable time. Manager came across a bit rude and impolite during the entire handling and phone conversations. I suggest the partners of the firm look into this. Also the prospective buyers, don't fall into the trap of blind bidding. It is your right to know what you are bidding against. No other agency I have encountered carries out the sale process so dis-tastefully.