I'm using a custom class for my org-mode latex file which is -

--8<---------------cut here---------------start------------->8---
#+begin_src emacs-lisp
(add-to-list 'org-latex-classes
             '("my-memoir"
               "\\documentclass{memoir}"
               ("\\chapter{%s}" . "\\chapter*{%s}")
               ("\\section{%s}" . "\\section*{%s}")
               ("\\subsection{%s}" . "\\subsection*{%s}")
               ("\\subsubsection{%s}" . "\\subsubsection*{%s}")
               ("\\paragraph{%s}" . "\\paragraph*{%s}")
               ("\\subparagraph{%s}" . "\\subparagraph*{%s}")))
#+end_src
[2016-04-16 Sat 08:22]
--8<---------------cut here---------------end--------------->8---

but all my subsubsections are coming out as -

╭────
│\begin{enumerate}
│\item Stop the abuse!
╰────

This is my file header, minus the title which isn't relevant

--8<---------------cut here---------------start------------->8---
#+LaTeX_class: my-memoir
#+LATEX_CLASS_OPTIONS: [a4paper,12pt,oneside,openany]
#+latex_header: \usepackage[mark]{gitinfo2}
#+latex_header: \usepackage{mVersion}
#+latex_header: \increaseBuild
#+latex_header: \date{Build - \version}
# #+LaTeX_HEADER: \usepackage[utf8]{inputenc}
# #+LaTeX_HEADER: \usepackage[T1]{fontenc} 
#+LaTeX_HEADER: \usepackage{mathpazo}
#+LaTeX_HEADER: \usepackage{fixltx2e}
#+latex_header: \usepackage[backend=biber,style=philosophy-modern,doi=true,hyperref=true,backref=true,backrefstyle=two,date=year,maxcitenames=3]{biblatex}
#+LATEX_HEADER: \addbibresource{~/research/hair/hair.bib}
#+LATEX_HEADER: \usepackage{makeidx}
#+latex_header: \makeindex
#+latex_header: \usepackage{glossaries}
#+latex_header: \makeglossaries
#+latex_header: \usepackage[unhide]{todo}
#+latex_header: \usepackage{everypage}
#+latex_header: \usepackage{draftwatermark}
#+latex_header: \usepackage{scrextend}
#+latex_header: \usepackage{hyperref}
#+latex_header: \hypersetup{colorlinks,linkcolor={red},citecolor={magenta},urlcolor={blue}}
#+latex_header: \setlength\parindent{0pt} % sets indent to zero
#+latex_header: \usepackage{chngcntr}
#+latex_header: \counterwithout{footnote}{chapter}
#+latex_header: \footnotesep\baselineskip
#+latex_header: \setlength{\parskip}{7pt}
#+OPTIONS: H:3 toc:t \n:nil ::t |:t ^:t f:t tex:t
#+LaTeX: \setcounter{secnumdepth}{0}
#+OPTIONS: toc:2
--8<---------------cut here---------------end--------------->8---

How can I get my org-mode level 4 subheading to appear as subsubsection
when the file is exported please?

Thanks
Sharon.
-- 
A taste of linux = http://www.sharons.org.uk
TGmeds = http://www.tgmeds.org.uk
Debian 8.4, fluxbox 1.3.7, emacs 25.0.92