Consumer referring to arbitration clause, filed along with another claimant for hearing before arbitrator Mgr. K., but the latter explicitly refused to resolve the dispute and, therefore, turned to the court which also turned down to settle the dispute for its alleged lack of competence. Complainant expresses its conviction that the contract does not imply that if one of two arbitrators refuses to deal with the case, proposal must be submitted to another arbitrator, what general courts deduced. He emphasized that the arbitration clause expressly states that the parties opted for the arbitrator Mgr. K., who however refused to settle the dispute. It is not possible to invoke a vague arbitration clause and to appoint arbitrator on an ad hoc basis. The complainant states that the appointment of the second arbitrator is invalid and courts should take account of this invalidity.