Blocking 1 single number on IOS6

Hi Guys,
Someone (probably a computer) in Morocco keeps calling me. It's getting a bit annoying, 30 calls per hour. If I answer, I don't hear anybody.
The number that's calling me is +212 (morocco) 602 4661 70.

I'm looking for a way to block this number. I have tried just about everything I could think of. I even made a new ringtone, especially for this number, without sound. But every time I'm working with my phone, the call's just keep coming in! I can't even use my phone to listen to music anymore!

I've tried blocking the number through my carrier, but T-Mobile Netherlands says they can't help me because it's not a Dutch number. They can only block national-numbers... The only solution they had for me was to change my number (Changing my number, because I'm being harassed by someone/something!! And it would also cost me 35 euro!!)... There must be another solution to this problem!

One solution I've heard about, is jailbreaking my phone and instaling iBlacklist.
But I don't want to jailbreak my phone (everytime I do, my battery gets drained)..

If you have a solution to my problem, please help! I'm desperate!!

 

Thanx mKTank, I did already give it a silent ringtone.. The problem is, as long as you are being called, you cannot use your phone. If you press the reject button, the start calling every 2 minutes..

I have contacted my carrier (TMobile NL), they are not able to block a number (I know, total bullcrap, but they won't..).
I called to another carrier (KPN), they also are not able to block a number (again, total bullcrap!).
I called Apple Care, they don't have any solution. There isn't an app that could block the call (not if it isn't jailbroken).. So they told me I should contact the police.
Called the police, they cannot do anything. My life is not being threatened, and it's a foreign number so they won't be doing anything about it!

So, just a small recap, TMobile, KPN, Apple and the Police are all not able to help... HOW IS THAT POSSIBLE!!??!? How is it possible for someone/something to just keep harassing someone, without anyone being able to help!
Is it that hard to BLOCK A FRIGGIN' NUMBER??

I didn't want to JB my phone, but if there isn't any other option .. I will have to do it...