tmobile note 3 on metro pcs only showing E⬆⬇ (imei changed)

Hi everyone I'm not sure if this is the right place to post t his but I have a issue and I'm seeking help I have a tmobile branded note 3 that I'm using on metro pcs I purchased it a few weeks ago and the seller failed to mention that he didn't pay the phone off so last week it was blocked by tmobile so a few days ago I took it to a store to get it fixed and it seems they changed the imei in the phone so it's back working but I'm no longer getting 4g or 3g it only shows E it's to slow to even download from the market so I'm wondering if it's something I can do from home to fix this problem or if it's best to take it back to the store I'm fairly tech savy so all suggestions are welcomed.

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