Refusal to credit

I usually consume +-100gb of data per month, for the month of Feb the tower was down/slow for most of the month, i called in to complain and was given the usual run around that the tower had an alarm and a technician would assist. i then cancelled my membership and was then debited the full amount even though it clearly states that the sim was active all month yet i could only use 20gb. I spoke to a Magdeline from the support team who refuses to understand that im not upset about the debit but the fact that i shall not be credited for days when my usage was negligent.

This is theft and i plan to complain on every single social platform till i am credited what is due to me.