multiple debits & blaming discovery

i was debited 4 times this month from planet fitness for my gym membership. in January a debit was not done so understandably i can see how a double debit can happen, however i need to understand why the debits totaled over R800 considering my membership costs R120 a month?<br> please could someone contact me and help resolve this problem as Discovery told me that my membership should be in order and there should be no unusual debits as I had to switch my medical aid from my company over to my personal capacity, however planet fitness has made this an admin nightmare.