Breach of Contract! Using my anytime data instead of my night surfer data!!!

I have an LTE package with Telkom which, according to the contract, gives me 60GB 'anytime data' and 60GB 'night surfer data (used between 12am and 7am).

My anytime data has run out despite me ensuring my heavy internet usage qualifies as 'night surfer' data. The call centre have admitted I used the data in these hours but their lame excuse is that I should have restarted my router for the 'night surfer' data to kick in.

This is a material breach of contract and the Telkom agent's exact words were "we will not refund you as you used the data".

I refuse to buy more data from Telkom when they have acted in bad faith - if it has to go legal then so be it.

I WANT MY DATA BACK.