SMS NEVER reflect the correct blance

This is now the third time I am complaining about the same thing. Why do I have to pay for an sms service when the amount that reflects as the available balance is NEVER what is in my account. I have had one excuse after the other. the fact is no matter what order the payments are banked the available balance should be the same. If the amounts are reserved until processed then it should be correct. This is not the first time I have landed myself in trouble because of your WRONG sms's. If I cannot rely on my bank to be accurate maybe it is time to move to a new bank! this is DISGUSTING!