My blackberry curve for sprint is slow on recieving my calls and texts?

People have told me they called me, except I never get the calls! And my texts...it will say "recieved at __" but my phone won't get the message until a couple hours later.... Anyone else had this problem? How do I fix it? Bcause it's causing problems, I never got the call asking for a job interview, my ride to school also called me 6 times to pick me up but I never got the calls, so I became tardy to class to many times and now on credit review... people wonder where I am because I dont get important messages. This is messing everything up! what should I do?
 
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