Membership Trial Help [URGENT]

Hey all, Recently i was creating accounts with rare names for my name shop, I found i was getting free 14 day trial membership on the accounts.
Obviously Excited, i created 4-5 accounts with decent names, all on 14 day trial
Now my problem is, My main account is on a recurring membership with credit card linked.
And so if any of my member accounts click buy spins, it can directly pay without entering card number and other details.
And now more on to the topic,
These new accounts that got trial membership, are asked if i want to sign up for full access of membership , i refuse, but then if i click yes, it shows a similiar interface like buy spins one, where i can directly click a few buttons and the payment will be made. without having to enter card number and other card details.
I cant obviously sell these accounts till the membership expires ofcourse for safety.
Also, I want to be 100% educated about this trial membership thing, like, a MAJOR question in my mind is that what happens once the trial runs out? does it start taking payment from card automatically or what? If so, im gonna get screwed bad. I can always break the link b/w my card and runescape, but that would mean cancelling my so far 12 month recurring membership, i do have a lot of loyalty points...
Can someone spread some light on this trial membership pros and cons? and how it is linked to my card, is it safe for someone to be having an account i got trial membership?
I would highly appreciate any help. PLEASE help.

thanks .

 

I can see the issue here. I don't have this issue I pay by phone it's easier and I wouldn't know what to then to be careful and stay safe. Pay attention or maybe cancel the creditcard and pay by phone like i do

 

Yeah I advise you to cancel your recurring subscription and instead buy using SMS or use a gamecard.

 

hmmm:| i really dont want to cancel subscription, if unable to figure out anything till last day of memship, ill cancel.