MTN line suspension still not resolved even though payment made as promised

Payment for our MTN account was made on the 7th of May 2021 as per arrangement. I even emailed proof of payment but our service was suspended on the 8th of May. I called mtn to rectify and we were promised our lines will be activated with 2 to 24 Hours. The call for reactivation was logged at 8:39am and it's been long over 24 hrs. I called the call centre again on the 9th May and I was told that the matter was allocated to the support department but still oiur lines are suspended.Poor service from MTN as we are still not able to make calls out.