We purchased a transfer for 2 people from the Barcelona Airport to our hotel. Paid for the transfer using a Citibank Master Card. Have verified payment was made in writing by our credit card company. Suntransfers says they have not received payment and has not provided our verification. After 4 conversations over 4 weeks thru chat with Suntransfers and sending written verification from our bank that payment was made, they still deny that payment was made. We have asked our CC company to retract the payment made and we will obtain travel assistance from another provider.