Unprofessional, unhelpful & ignorant

We had a terrible experience with hotels4u. We booked a all-inc in rhodes island with them. We got confirmation and then booked all our transfers. That evening one of their representatives called and asked my credit card details again apparently for security checks, i told the person the money has already been approved and i already have an confirmation and hotel voucher. I didn't really want to give my credit card details to a stranger over the phone. Eventually he said that i am a fraud and he is going to cansel my booking. I was shocked and assured him he can call my bank if he suspects anything but he can't just cansel my booking as I already booked and paid for all my transfers. He hanged up on me. I then phoned my bank, they said the money has been approved. I then called the hotel, they confirmed my booking. We travelled all the way to rhodes island greece. When we arrived at the hotel they said that hotels4u had canselled the booking and they only got it after i had called. They refused to give me the same rate as my original booking and quoted me almost double the amount. We were furious and tried to call hotels4u but we could not get through to someone that can help us. We spent one night at the hotel and were forced to get another one the next day.Its been 2 weeks now and we still havn't heard from anyone. We have never had such a bad experience ever. I mean how can you cansel someone's booking just before he arrives at the hotel....? Tranfer costs these days are so expensive. I will never book with them again and can highly advise anyone to stay far away!