Struggling to get out of TANNING CONTRACT

I have been struggling since 8 December 2014 to cancel a Tanning Contract held at Tan Active Parkview Mall Pretoria. They have been deducting the money from my account for four months now, after it should have been cancelled. I finally got to speak with Aileen de Beer (Manager) this morning who clearly had the worst attitude. After begging her yesterday via email to please respond before the end of the day, or I will be forced to go to social media she clearly did not respond. She also told me this morning that she does not respond to threatening emails. Now I ask you as a consumer/customer.....How can I not threat them after no action was taken from their side in almost SEVEN MONTHS.<br> I only want them to cancel the contract, and pay me back the instalments that were wrongfully deducted from my account. I would also like to have a meeting with the owner of the salon to clear the air, as their manager is unable to handle difficult situations/customers with tact.