Help please - not getting much sense from Barclaycard

Hello,

I wonder if someone could help me with this please?
I want to change the date on which my Barclaycard statement is issued from the 13th to the 1st. Not a major problem you would have thought - so I called the customer service number, first operator listened to my request, said he would have to speak to someone else and promptly cut me off.

Tried again, spoke to a lady this time, found it really difficult to get her to understand that I wanted to change the statement date not the payment due date, thought I had got her to understand so at the end of the conversation I asked her to confirm what date the next statement would be issued and she said it would vary - could be anytime between the 26th of the month and the 8th of the month so she obviously was still talking about payment due date - gave up

Found a complaints phone number on my statement which I then rang and got a third operator - is this the complaints line I asked? No it is customer services again !

Does anyone know how to make contact with Barclaycard in the UK as I now do not know when my next statement will be issued.

Thanks