VERY UPSET CLIENT WITH TELKOM

I have a contract with Telkom , where I am suppose to be getting 1 GB every month, the debit always go off on the agreed date , but the service I got last month and this month is very unpleasant, I get the 1 GB on the 1st of the month and it normally last me for at least until 25th because when I am at work I use wifi and at home I use router from them (Telkom) thats how I liked this service provider , but now I am not so sure about anymore , so on the 06.07.19 when I was on my way to Springs from Johannesburg , I opened my GPS as usual and it just stopped communicating with me so I thought its a technical error, I had to stop the car and buy data because my 1 GB vanished, today I called them spoke to Nthabiseng Kgosi and the lady kept on putting me on hold , but came back told unfortunately she cant assist me , because I use 823 MB in one day 06/07/2018 and only used data for GPS on that day , and the lady told me that yes I used 823 MB in one day , and they cant prove it .