I signed up for the half off Premium price and it shows USD 9.95 Monthly for my billing

[Krazor Razor]

I signed up for the half off Premium price and it shows USD 9.95 Monthly  for my billing, how do I know if I got it at the promotional rate?

[Lindal Kidd]

You had to choose the Quarterly plan to get the half off deal.

[Ceera Murakami]

I'm afraid you selected the wrong membership billing plan. The discount was only for new users that went with the quarterly billing option. The link for the promotion's ads would have defaulted to having Quarterly selected, and that option was also highlighted. The monthly and annual options were there too, but not at a discounted rate, so if you clicked Monthly, which it seems you did, then you agreed to sign up at the normal monthly rate.

Contact billing, but odds are they will not change anything for you. They never give refunds, that I have ever heard of. The exact rates were clearly stated on the page, for each of the billing plans, and the fine print on the page did state that only the quarterly billing was at the sale price.

I will recommend that if billinbg won't help you, then you should switch to annual billing if you intend to remain Premium. Annual costs only $6 USD a month (one payment of $72 USD, good for one year), as opposed to $9.95 per month when billed monthly. A quarterly membership normally comes in halfway between those two prices.

The quarterly half price deal was only a "good buy" if you immediately switched to annual billing, anyway. The discount is on the first three months only, and then renews at the full rate. Here's how it works:

After those first three months, it renews as quarterly again, at the full quarterly price. So if you fail to switch to annual billing before it auto-renews, it will eventually cost you more to take them up on this "special offer" than just ignoring it and signing up as an annual membership at the regular price to begin with. 

3 months at $11.25 = you save $11.25 off the quarterly rate, or $6.75 off the annual rate.

3 months at $11.25 + 3 months at $22.50 = you effectively pay $16.875 per quarter, or a savings of $5.625 per quarter off the normal quarterly rate. You still save $2.25 as compared to the annual rate billing.

Let it auto-renew a second time, and you're losing money, compared to the annual billing rate.

3 months at $11.25 + 6 months at $22.50 = you effectively pay $18.75 per quarter, or a savings of $3.75 per quarter off the normal quarterly rate. You lose $2.25 as compared to the annual rate billing.

Let it auto-renew a third time, and you're losing more money, compared to the annual billing rate.

3 months at $11.25 + 9 months at $22.50 = you effectively pay $19.69 per quarter, or a savings of $2.81 per quarter off the normal quarterly rate. You lose $6.75 as compared to the annual rate billing.

Also, this offer is only for upgrading from Basic for the first time ever. You can't use it if you are a current Premium member and want to extend your membership inexpensively by three months, and you can't cancel a current membership and upgrade later at the discounted rate, the next time they offer this deal.