Daily Service Charge?

I have T-Mobile "Pay-As-You-Go" service on my very first Motorola phone. I must purchase refill cards when my balance gets low. I make few calls so I decided that I don't need a service plan. When I check my balance on days that no calls were made or received, I notice that my account dwindles down on a daily basis. On their website, no mention is made of extra charges when using "T-Mobile To Go". It states that customers only pay per call. I now believe that there is a daily service charge of about $1. If true, then paying over $30/month in service fees is no bargain. Do other carriers also charge a fee per day for service?

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T-Mobile To Go does not have any daily access fees, only the Sidekick plan which is a $1/day. Did you send any text or MMS messages?

No, until today I didn't even know how to send a text message. I also got charged when I read the message T-Mobile sent me with my PIN number. Is there a possibility that my dealer added something to my account that I am unaware of? If so, how could I remove it? I am definitely getting charged every day even when I don't use the phone. One day my balance is $17, the next it's $16. I called T-Mobile service but got the run-around.