ASF International Samuel Lugo Unable to cancel my contract, and random charges , Internet

I have been trying to cancel my membership for over a month.  I've paid the cancellation fee, but I am still getting billed for my membership.  Also, there is no rhyme or reason for the charges.  Example, when I joined Fitness 4 Less in Bowie, MD they told me I would be charged $19.99 a month, with a $20 charge every six months for "club improvement."  In the last month I was billed $20 twice, and $19.99 once.  So $59.99 a month, and this has gone on for months.  When I reached out to this gym, they said they had no idea and to contact ASF International.  I would rather eat a bullet then join any gym that uses ASF International.