Cell C
I have never been a Cell C client, what account???

(second attempt at a solution)
Dear cell c

Kindly note that I've never had any dealings with your company and have never had a cellphone contract with you,

I hope that you rectify this speedily as I'm being contacted by rude collections agencies during working hours, this is an inconvenience to me as someone who has never had any dealings with your entity.

I trust that this matter will be resolved expeditiously and I will be kept updated at all times.

(no resolution received to date, second attempt)