MTN STATEMENTS

MTN send their customers accounts every month electronically (e-mail), you then have to open the login page. From an link in the e-mail, they SMS you an OTP and then you can view or download you Statements and Invoices:

Since March 2019 they send me every month the statement for March 2019, and the correct invoice for only one of my 4 phones. The Phone number for the OTP on the login page is also not correct and I am not able to change this number to my phone number. Every month I lodge an complained at MTN Customer care (ref ***, but up to date they did not addressed the problem. Pleas assist.