How to change my big bundle tariff back to a pay as you go

[Beens]

I have a pay as you go sim with a big bundle tariff but I have been sent to work in the Middle East for a few months. I do not want to renew my big bundle tariff here as my allowances don’t work. I need to receive calls from my bank back in the uk so I need some balance but if I add a balance then my bundle will renew. 

how can I remove the bundle so that I have no bundle? I can only find how to change my tariff not remove the bundle to go back to the original pay as you go. 

[madasaf1sh · Accepted solution]

@Beens 

You cant is the simple answer as the classic PAYG tariff has been removed, best option is to port your number to giffgaff who still offer a classic PAYG tariff. 
But be aware calls to the Middle East are chargable and are very expensive for you to receive them at £2 a minute on o2 versus £1 a minute on giffgaff