Telkom ******** Behavior

I did my upgrade on the 29th of Feb and was charged a full months device charge for the month of Feb. I tried logging the query online a number of times but received no response. When calling on the 27th of May to query it, the call center agent (Sinenhlanhla Mlangeni) insisted that it is meant to be that way. How is it fine to be charged a full month for the use of a device that I received on the last day of that month. I am happy to pay a pro rata amount but not for a full months usage. I asked for the matter to be escalated to a manager/team leader and was told by Sinenhlanhla that she cannot transfer my call due to working remotely. She emailed the Team Leader but to date I have not received a response.