Old Number retrieval

Very disappointed. I've canceled my one2one contract in March 2019. And I provided the alternative number to contact me on, as my contract number was deactivated. Unfortunately I have not received any response regarding that number. I've tried to call your call center, couldn't get through as it was ringing forever. When I called MTN I was told my number was activated around June 2019 and it was deactivated. This means I would not be able to get my number again. I'm very disappointed with your service