Agent phoning, but didn't identify as Cell C, asking salary information

I was a bit hesitant to give this rating, as I am not even sure this is a Cell C issues. I got two phone calls this morning, from these numbers: +*** (unanswered) and then +*** (answered and a pathetically rude woman was on the call)

So, this woman didn't identify her name, but said she was calling from a company whose name I could not make out, Which WASN"T CELL C - she informed me that they are the company that provided me with my "Device" on my cell C contract. I asked her if she was from cell C and she said no, only the people that provided the "Device to me" and they are updating their records. I asked her why They needed this info as Cell C is the company I have the contract with, and she said something about Data is only with Cell C and the rest is with them. I then asked her to identify the "Device" as by this time I am a bit suspicious, and she couldn't (was apparently looking it up". Then she asked me about my job, and started asking questions about my salary.

At this point, I asked her why do they need this information from me, as they are not Cell C: Her response is if I keep asking here these questions, this is going to take a very long time. Then she exclaimed "she is not a child!" and told me to go directly to Cell C and give the information to you. I asked her again what her name is and she just put the phone down on me.

Who the hell are these people, is this actually a company that Cell C is doing business with or was this a **** call? As the number does show it is from Cell C.

And in this day and age, with all the **** going on, surely this lady (if she is contracted to CELL C) should lknow that people are susupicious. Her attitude was ********** and she should not be on a phone.

I would like to know the outcome of this please, as this is disgusting behaviour from a call centre representative, or whatever the hell she was.