Very bad service

I have been calling old mutual super fund for three weeks now and still my problem has not been resolved. Whenever I call I am being told that my problem has been escalated and they will get back to me. Everytime I call asking to speak to Seal Titus, the team leader that is handling my case I get told that his not in the office or they say he will call me with feedback. How does a team leader stay away from work for three weeks. I got a message from SARS saying I must pay R3700 by the 30th of November 2019. when I went to SARS to find out the reason I was told that old mutual did not reconcile the directives of the payment that was made to me in March, we are in November and still it has not been done. I cannot afford to pay something that old mutual faulted on. I spend almost R30.00 per each call cause they take time answering calls and I call them two to three times a week. I am spending too much airtime just to get this matter resolved. Can somebody please help me with this case cause I cannot keep calling and not get assisted.