actually, sa balaud, it is not allowed. but, the credit card issuer (citi, hsbc) can... that is because it takes time for them to collect from u, remember next few weeks pa cla maningil nimo. its like 5-6, but legally and politically allowed, hehehe... it is not the store charging you that price, but the issuer is. its in your contract, mabasa na ninyo, say 3% (i dont really know how much). so the store gets the right amount, the credit card issuer gets the add up. and u get the "hold up", hehehe...
if makakita mo ug 0%, promo na... say 3,160/month for 6 months at 0% for the Sony Ericsson nga phone at CyberZone SE...
as of that "price-tag" thingy, yes, true na pude ka maka-reklamo.. but remember, "big" companies know better than u, n, well, more powerful than me n u. i'm not giving u the negatives, it just that u might just be wasting your time with sa DTI.
cheers