Three Network reduce FREE internet from 150Mb to 10Mb upon top-up

Not sure how long this has been going on for as I only top-up every 6-9 months

But noticed this week when I topped up £10, I only got 10Mb Free internet allowance (instead of the 150Mb they gave me last time I topped up)

http://www.three.co.uk/Support/Pay_As_You_Go/Phone_tariffs

Three-to-Three calls 3p / min
Texts to any UK mobile 2p / text
Mobile internet Free allowance of 10MB with every top-up, then 1p / MB
Voice calls to other UK mobiles 3p / min
Voice calls to any UK landline 3p / min
UK video messages 40p
UK picture messages 40p
Calls to voicemail in the UK 3p / min