Read the wrong parshah?

Hi,

At minchah on Shabbat, and at Shacharit on Monday and Thursday, we call up three aliyot to the Torah and read from the beginning of the coming week's portion. If the first aliyah or two were read from the wrong parshah, one should use the remaining aliyah or two to read the proper reading from the correct parshah.

(Rivivot Ephraim 1:107 - and see a discussion there about what to do if they read all three aliyot from the wrong parshah)

Have a great day,
Mordechai