Gym Membership review: Cancellation Denial 2

I asked Lifetime Fitness to Cancel my membership and I submitted a written request in person to the membership services desk. The Membership representative took the request and guaranteed that I fulfilled the requirement, no other actions are required on my end, and the cancellation will be activated in 30 days. When the 30 days period passed, I found out that Lifetime was still charging my credit card for the monthly service. I contacted them to address the issue, but they denied ever receiving my cancellation request and were very rude when i argued that I submitted it in person. They did not apologize for the confusion nor tried to address the issue. Now they are requesting another 30 days from the day they receive the second request and will not refund me the money for the canceled membership charges (3 months worth of charges).
As a customer, I am upset and frustrated because I have to submit a second request that I am not sure it will be effective this time around. I am paying the price for an inefficient system or a slacking employee. I am still waiting for a response to my second cancellation request. I think Lifetime is taking advantage of its customers, has inefficient system, and unethical.
My advice to others: When you cancel your membership with Lifetime insist on having a form or letter acknowledging the recipient of your request and ensure it is signed by the employee receiving the request. Lifetime did not provide a a confirmation letter when I canceled. I did not think they will take advantage of me, pretend they never receive my request or loose it, and make me pay the price anyway!