I have two Barclaycards, and with the first, I received the 'we do accept your proposed changes.'
With the second, they have now sent a letter to me saying 'We do not accept your proposed changes.' This was in response to the third letter.
Does this change anything? Or should I invoice now, as I did before?
Are you living in fear of Banks and Debt Collectors letters and phone calls? Do you worry about Bailiffs visiting your home? 
