Dodging my complaint

<p>I have a serious complaint against the bank. I have received the bank's acknowledgement of receipt of my complaint and they have given me a reference number for the complaint. After 7 business days or so I then received an email from Marlon Saunderson that the complaint has been forwarded to a "specialised department" to further investigate the complaint and he advised that the "specialised department" has a 20 business day turnaround on these issues. It has been more than 20 business days no response whatsoever from the bank since then. On Friday 03 Marh 2017 I sent an email to Marlon to give me an update regarding the specialised investigation, till today no response today is 06 March 2017. On the 03 March 2017 I sent an email to the Complaints Resolution Department for an update still no response. So what do I do? I need a written response from the bank to see what their respnse is so that I can see if I can take this further. Please I need my response! </p>