Pathetic Client Service

Worst possible client service. BA committed to refunding us (me and my wife) with cheques since our flight was delayed on two occasions in one trip for more than 5 hours. BA claims both cheques have been delivered and has been cashed already. Neither of us have received our cheques yet and BA cannot give us any details as to where the cheques were cashed and how since it was made out to us. Pathetic client service as I have been trying for more than 2 months to get a hold of someone to help me. No response! No Help! I will not be recommending BA flights to anyone and will not book any of my employees' travel tickets through them ever again.