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I topped up my account before the £10 big bundle expired and my account is set to renew but this hasn't happened and now my account is showing £2.50 i.e. not enough to renew the big bundle?
Has your Credit been used to make calls, texts and use data ?
Something has glitched if you had top up on ready for the BVB renewal.
I'd suggest to call Customer services on 191 and or use Live Chat.