Contract Cancellation MTN

Good day, I've been trying tirelessly to get assistance with a contract cancellation with MTN, they (MTN) finally notified me that I can’t cancel the contract because I’ve gone beyond the cooling off period, and they advised me to contact Mondo if I have any questions, of which I did. I chatted with one of the consultants who indeed confirmed MTN’s story. However, this is far from the truth. The device was delivered at my house on 9 February 2021, and I requested to cancel the contract the same day I received the order (I have both the email and reference number to this effect). Your consultant advised that on your system it shows that I only emailed on 9 March 2021, which is totally false, I find this to be rather dishonest, how come my email only reflects 1 month later but on exactly the same day (the 9th). And the consultant cannot advise why the dates are different. Please can you cancel this contract, as I did all that I needed to do on my side, I was well within the cooling off period.