Why is my Orange credit disappearing?

Yesterday I topped up £10 on my iPhone 4. I sent a couple of texts, and was at £9.00 credit. I received a text this morning from Orange saying I only had £1.00 credit left, and so 2 minutes later I called the top up number and suddenly I have 0 credit.
I heard this has to do with data roaming but that has been turned off this whole time, and I have't received any dodgy unknown calls or texts. I'm connected to my Wi-Fi only so I don't get why this is happening. Any ideas/solutions? Does it have something to do with cellular/mobile data being left on?

When connecting to Wi-Fi it is important to remember to turn off your phones network provider connection (you will not be able to make or receive calls/texts once you do this) as this takes priority over Wi-Fi.
Have been on Orange payg since year dot.
Always use Wi-Fi for phone internet and have never used a single penny of credit or a single bit of internet allowance by turning phone connection off.

I've had this problem several times with orange. Just afew days ago checked my balance in the evening £6.11 was there, made sure Wi-Fi, data switch etc was off, sent acouple of txts (should be free), checked balance in the morning 35p. When I first tried registering to dolphin tariff only txting 450 and using there links some how wasted £15 of credit. I showed them the txts in store and the times to show the credit had gone in 20 mins and just got told phone customer services. They also don't tell you that you have to have credit on your phone to use your free internet allowance.

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