Huge Cellular Data Use / Drain, While On Wi-Fi

Anyone else got this? I'm very concerned as my 8gb / month data allowance is being swallowed up, and my carrier, Vodafone, just advise it must be the handset - and charge me for extra data, and Apple so far haven't diagnosed the problem...
On my iphone 5s I'm having a huge cellular data drainage problem, seen in Settings > Cellular > System Services > Docs and Sync  and I'd be very surprised if there aren't many others with the same as it seems to me to be fundamentally linked to the iOS or the handset.
In the first 12 days of this billing month ( since Nov 22 ) my cellular data usage was nearly 8GB - my limit is 8GB and usually I use around 500mb of that. So I'm now paying Vodafone for extra data.
Spent a couple of hours online with Apple Support today  - my cellular data usage increasing from 3mb to 30mb  as we spoke  - and much of the time I was on wifi.
Result was that Apple had me restore iphone as a new phone over itunes and reinstall 8.1.1 afresh; theory being that a fresh restore ( ie none of my apps, non-Apple mail accounts, or media on the phone ) should clear anything that may be causing Settings > Cellular > System Services > Docs and Sync to show high data usage.
But with Settings > Cellular Data switched on, and no apps open or any activity on my part,  I'm seeing he exact same thing - around 45mb of data use in Settings > Cellular > System Services > Docs and Sync in less than an hour.
Feels like the phone has been hacked in some way.
Update the following day:
I've kept the phone on the full  restore (ie not reverted to any of  my backups, as I had planned ) today - kept a record of the apps i installed and Settings changes made... the data drain has continued, so in Settings > Cellular > System Services > Docs and Sync the data use is now 108mb - and this is while being on Wifi the whole day except for around 30 mins walking to / from a restaurant.
I've seen this iPhonedata drain issue raised elsewhere on the web, dating back to 2012 - but the posts I see never update to a conclusion.
Another talk to Apple tomorrow. If anyone has had this issue and resolved it I'd really like to hear from them!

I haven't been able to solve the problem yet but I think I'm getting closer. I've noticed that the data drain stops when my iMac is turned off, and that the data drain on the iPhone starts immediately once the iMac is turned on!!
I turned off my iMac on Friday and had no data drain all weekend. As soon as I turned the iMac on today the iPhone "Documents & Sync" started to go crazy again. I logged out of iCloud on the iMac and the drain on the iPhone stopped! So, I don't think this is an iPhone hardware problem at all!
To me it seems it's a bug in the iCloud service. Although all the configurations on the iPhone are saying that it should not use 3G, and that it should use the WiFi, it still uses the 3G somehow for some sort of synchronisation with my iMac. This is clearly a bug as I don't have anything on my iCloud drive and I have set Calendar/Contacts and Notes to sync only on WiFi. Apple please sort this one out. For now I'm switching cellular data off on the phone when I'm working on the iMac. It's the only solution at the moment.

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