Orange are the shitiest of the shit
I moved from Orange PAYG to GiffGaff about six years ago, mostly because of the Orange spam.
I actually made a fomal complaint to the then regulator about it but the reply was that the Orange "magic numbers" spam wasn't spam because it was an informational txt from my mobile provider! I'm sorry but if anyone believes that something calling itself "magic numbers" isn't spam then they deserve all the scorn that they get.
It wasn't till I'd been with GiffGaff for a month or two that I became aware the txt's never went missing nor were they delayed for up to several days at a time either. The GiffGaff service knocks seven colours of shit out of Orange's.
My day job means I deal with clients who may have issues with creditors. Orange do not top the polls for worst mobile provider for nothing. The best thing anyone unfortunate enough to have business with them can do is leave for another provider as fast as they can.