Suspension date has to coincide with billing date

For years, I've been suspending my account when I go on leave in December. I then get the credit remaining for the month offset from my January account. <br> <br> DSTV has recently \upgraded"their system so that they can only suspend/cancel from your billing date. This is a huge step backwards and they've lost a great feature that was extremely handy. <br> <br> Why can we pay pro-rata when you join in the middle of a month but not cancel to the same effect? The call centre agent said this was in the terms and conditions I signed (probably under those iffy sections saying they can change billing at their will)"