Disable second sim phone number

[marimeza]

Hi, I have a Galaxy Ace Duos GT-S6802B. I use just one Sim card, but yesterday my friend who's phone was broken asked me to try her Sim on my phone because she needed a number urgently. I used the second sim slot and got the number she needed. I took out the sim (the second sim) and my phone worked perfectly... until I started to receive calls ment for her number, even thou as i've said, I had taken out the other sim.
Now I keep getting her calls, pls help.
Thank you!

 

[famouzstarz#AC]

battery pull reboot

 

[marimeza]

Thank you, no use...

 

[fablis]

You may need a factory re-set then.

 

[marimeza]

Thank you, did it twice... still receiving calls from the other number