TELKOM EMAIL SERVICE DOES NOT WORK

Since March 2019 I have not been receiving all my emails sent to my telkom email address. When I send emails from my Telkom email address I very seldom receive "delivery" or "read" receipts from Telkom. The matter was reported to Telkom on 2019-03-07 IT Service Desk reference no. ********** . I have been phoning them regularly since, but they were still working on it. On 2019-05-25 I again reported the matter, only to be told that reference ********** had been closed, as the problem had been resolved, which of course was incorrect. They then gave me a new reference number ********** 62. This whole week end I have not been receiving emails sent to my Telkom email address. This morning, many emails which I was expecting didn't arrive, What is one to do ? For Telkom's reference my account number is ********** 05897