Kept me on hold for 45mins then hung up on me

I am very irate as this is not my first bad service encounter with Telkom! I bought 250mb of data and went onto Whatsapp as I usually do. Within 15 mins my data was depleted. I then bought another 100mb and it was also depleted within mins. I then bought another 100 which also didn't last. I called the call centre to enquire, I spoke to an agent named Brenda Ndaba, who only told me that my data was depleted but did not explain why as I had not changed the way I normally use it and I had no apps on. She then told me that get supervisor Andy Maboshego would speak to me but he didn't. I was then transferred to the data department Nokuphila Ncube failed to assist me and put me on hold for 45mins then said her supervisor Njabulo Dube would assist me, I waited another 15mins then went through to Njabulo who put me on hold then hung up after 10mins without assisting me. I have called back numerous times but this supervisor is unavailable, busy or doesn't exist. I would like an explanation as to why I was left to hold and then hung up on. This was very rude and unacceptable. The people named above should be managed accordingly. This is NOT customer service. I want answers about my data