Paying off mobile contract with piggy bank rewards

[ATay1993]

I've been a long standing mobile customer and have a huge amount of piggy bank rewards 'banked' 

We're moving out of the country soon and I'll be paying off my mobile contract remainder in full to take my phone with me. 
Presumably not but I wondered if there is anyway to convert my piggy bank rewards (like you can towards new devices) to pay off some of my remaining contract. 
I guess not but there is no harm in asking. 

[caesarome]

@ATay1993 

As you have said this isn't possible as while you can pay off what you owe in full.by calling Sky you can not use spare data to do this.