Please give me my Cell Number bac****

My cell contract recently came to an end on 12 Feb 2018. I sent in a request to discontinue the contract on the 16 January 2018. I clearly stated that I wanted my number to be retained and used as a prepaid sim. Some genius on Telkom side decided to cancel my number, now I cannot receive any calls since 13 February 2018. So i don't know how many important calls I have missed and how much business I have lost due to this fact. And all they(Telkom) can say is "We apologise for the inconvenience"

I really need this to be sorted out urgently. Is there anyone out there that can advise further..?

This case sounds like a claim can be made against Telkom...