4 months ago I applied for a new credit card to transfer the debt from my original credit card to pay it off interest free . I did transfer the money. Now I have a new offer from my original credit card for balance transfer zero percent- for longer period than the other card. Am thinking of transferring the money back to the original card to pay less monthly but longer interest free. My question is will this affect my credit? Bearing in mind am not applying for credit. Another question : is it worth spending on another one off payment to transfer the debt back? TIA