You don't have to call them. log in to your YSM account and on the right top corner click on 'Support Centre'. Now click on 'Support Request Form' and write "please change my payment type from "Prepaid Non-Stop Plan" to "Prepaid Deposit Plan".
truezeta, why cancel the account? you can just turn it off. or send them a support request form like described above.
Guys, I agree to all your complains but for me YSM is great. The interface is bad, the service is bad, the site is complicated and slow, but the results are good. It took me a long time to get use to it and find the right way to use it, and now I get great conversions from YSM.
Conversions is all I care about. The rest is cosmetic.