Incorrect billing date

I am very disappointed with the way planet fitness customer care department treated me, I joined the gym at Rosebank on the 27th March 2015 and asked that my debit date be the 25th, to my surprise I was debited today being the 1st full month subscription not even pro-rata. I called their call centre spoke to Zanele who kept me waiting till I hung up and did not get back to me, I then called again asked Lungi to transfer me to Zanele and no one answered, called again I spoke to Patricia and had to explain myself again of my query who promised to get back to me regarding my refund. I then called again around 3pm spoke to Pro Baker I explained again not sure if no one captures notes on their system he said he will call back. I only have 6 days with them and already not happy with the service even thinking of cancelling my contract. I still don't understand why should I suffer for a mistake that was not done by me but by their capturing department.