No refund from telkom

I have purchased unlimited LTE data the new product which work from 12 midnight until 7 p.m. then I wanted the other one which work from 7 p.m. to 12 midnight I've purchased same bundle twice I called the customer care to be assisted on that matter to switch the other one so that I'll have coverage throughout all time frames they said they can assist me and there's nothing they can do and then I I insisted asking for a refund then they said it can't happen I also asked to be credited for the next month they say they don't have control over that so there's no assistance instead I've wasted my money twice no assistant they can't change the can't can't tell they can't reverse they can't refund so I asked why the system can't assist or can't change what whatsoever they have control over it's more like daylight robbing because now if you make a mistake and then you by Chase airtime or data and then you need you reversal or a speech or refund they can't assist so it's robbing at some point the customer service is very poor