Strange ticket changing thing...

Hello,
Here's an odd one... my parents brought tickets using MPM to fly to Barbados and I brought mine not using any miles. They brought an economy return in X class, I brought a Economy outbound and Premium return during the sale in N and K.
We now need to change the dates, I call the silver flying club number and am told to move the dates from November to April will cost me a £50 change fee, plus an extra £224, they call the red flying club and change the tickets for just £50 each, that's it.
I suggested flying both outbound and back in economy to avoid the £224 but alas no deal..... anyone else have a similar situation?
Here's an odd one... my parents brought tickets using MPM to fly to Barbados and I brought mine not using any miles. They brought an economy return in X class, I brought a Economy outbound and Premium return during the sale in N and K.
We now need to change the dates, I call the silver flying club number and am told to move the dates from November to April will cost me a £50 change fee, plus an extra £224, they call the red flying club and change the tickets for just £50 each, that's it.
I suggested flying both outbound and back in economy to avoid the £224 but alas no deal..... anyone else have a similar situation?