I have had endless problems - they just don't seem to listen to requests very well and some of them have a real attitude on the 'phone.
I have called at least twice to change credit card details and left messages - no-one has called me back. Called again just now and got stroppy bint as dared to mention my phone calls hadn't been returned - no hint of an apology.
Have asked for three or four other things in the past and they haven't bothered to come back to me.
Lack of customer service really pi&%es me off -