Sky Bundle not Activated

<br> On 6 April 2015 I purchased a Sky Bundle for R999-00 for 30 days and had no problems till I needed to renew it on the 7th May 2015. I purchased R900 airtime on the 6th May and realised that it wasn't enough so waited till the next morning at around 6h25 and purchased a further R100 airtime after which I IMMEDIATELY purchased R999-00 Sky bundle for the month of May. I continued with daily calls and updates as normal until I received an sms stating that I received R290 free airtime(Only happened when I was using Daily airtime) so I decided to check airtime balance and was surprised to find out that I had R576-00 Airtime. I should've had unlimited calls as it was the previous month.<br> <br> I proceeded to call the call centre 173 and spoke to Grace at JHB call centre whom informed me that my bundle has indeed NOT yet expired and will only expire on 22nd May 2015. I asked how this is possible because I purchased bundle on 6th April 2015 and should've expired already and she could not explain it. Further she said that because I have an active Sky bundle I cannot activate another bundle explaining why I had airtime and not another bundle. <br> Mtn owes me a Sky Bundle due to a technical error