Depleting Data

I took out a Data Plan Deal for 5 GB daytime and 10 GB night time surfer for R99pm at the end of November 2017. For the past few months this data literally lasts 2-4 days. I am not downloading anything. I am not live streaming anything. I literally use it just for social media which I am hardly on. In the month of January my 10GB night time surfer lasted about a week, my phone is off at night and I put it on at 5 am and put it off before 7 am. So I am not sure where my data is going to? why is it depleting within days? Can anyone please explain this to me? Last night, 27/02/2018 I bought data( which I have to do all the time as my data plan lasts but a few days) from an Absa App and got an sms from Telkom saying" Dear Valued customer, we received your recharge request and apologize for the processing delay, your ref number is : MR0013FKQZ. Kind Regards, Telkom. I am yet to get this data..... I wouldn't purchase it if I didn't need it. Your service recently is not very good which is such a disappointment to me. Can you please provide me with my data? Can you please figure out where my data is going to? Calling your client care line is a nightmare. You are more than welcome to email me your response on my email address provided as I need an explanation as to what is happening asap. Thank you