Still waiting for mtn to give credits

During lockdown I noticed that our phone contract bills were higher that what we initially took the contracts out for by +/- R300 every month. I contacted mtn customer care via email ref: ********** In the beginning of May. This is the response I have received - Please accept our apologies for the delayed response and any inconvenience incurred. Kindly note that your bill was high due to the discounts which were not app**** from your 2019-11-26 invoice to date on all your numbers. We have logged a request with our system's support team for your discounts to be loaded and the billing team for your account to be credited with the discounts which were not app****. The reference numbers for these are 1-**********2, 1-**********9 and 1-**********5 as SMSed to you. Please allow for 2-7 days for your query to be attended to. Once resolved you will receive an SMS notifying you of that. However I am still waiting after a month for these credits to be passed. I am worried that our phones will be cut off due to incompetence as I emailed again waiting for an update on the 9th of June and again on the 15th of June.