on 24-08-2014 11:51
Last resort if On refresh is to pay off the handset plan and move the number onto a 30 day rolling contract or payg account.
on 24-08-2014 11:54
The cheapest unlimited contract tariff starts at £18.00
OnePlus 6 (O2 & Sfr), Z3 Tablet (Three UK), iPhone7 (EE)
on 24-08-2014 12:43
Or as suggested above move to an unlimited tariff for calls which would also resolve your issue although it may cost you a little more than you pay for your contract now (but would stop the large bill shock)