Poor service / rude staff

Such poor service trying to retrieve proof of purchase. I wouldn’t recommend opening an account with this institution. I purchased a dishwasher and it’s faulty it’s been 2 weeks back and forth with Game and RCS and up until now I haven’t received any assistance.The call centre assistant had the audacity to tell me I’m supposed to have the proof of purchase as they cannot retrieve old records. The unit is under guarantee how is it possible that no one can access the information.