Extremely poor customer service by SANLAM

I transferred received an IRP5 from sanlam 3 months ago. After submitting my tax returns I reported to Sanlam that they made an error on my tax directive number. After a month they finally admitted that they made an error and promised to resolve the problem. It has now been 2 months and Sanlam has not responded or rectified the error. I have emailed their complaints department and they are also ignoring all my emails. There is no direct telephone number that I can call. Does anyone know how I can resolve this matter because it is not important to Sanlam and I will be penalized by SARS not them.