Terrible service from SARS to say the least

I went to SARS to try and rectify a mistake I made on e-filing, was told to bring in the forms I submitted. When going to SARS with my forms they were closed because of COVID-19. Now I get an sms "Dear Taxpayer, Your account for tax reference no: *** is R16044.81 in arrears. Kindly settle the full amount immediately or contact SARS on ***to initiate payment arrangements and avoid legal action. Kindly ignore this message if full payment has been made. SARS." Now, how in the hell do I get help if I can not get into SARS building and not alowed the get it rectified electronically I ask myself. Wonder if anybody from SARS can do their work in helping me? I guess not