MTN close tickets woithout resolving, unable to run my business because of MTN

for over 6 months I cannot login to my billing portal on the email link sent to me, account is locked. NOBODY can unlock it. As a result, I have been unable to view the staff's cellphone bills to identify abuse nor am I able to bill clients for the calls made to them. Even the BSSP is not working. My complaints fall on deaf ears, and MTN close the tickets without resolving. I will try complain to ICASA as well.