overcharged on account, now struggling for refund

in July last year when getting an upgrade store had a problem setting data limit to 0, Query was logged, store failed to follow up and i have since been overcharged nearly R 7000.<br> i have been to the store, who promised resolution in 3 days, 3 days passed and i heard nothing. I then called 808, who said investigation would be complete in 5 days, 5 days passed and I heard nothing AGAIN... called 808 today and have been told to return to store to escalate!<br> I am so frustrated now, I JUST WANT A REFUND,none of this is my fault.<br>