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Ice in a frost-free fridge/freezer is usually caused by a faulty door seal.
If a refrigerator or freezer has a bad door seal, the outside air will pass into it and cause the ice build up problem you are experiencing, as water moisture in the air is frozen when it enters the appliance.
Another possibility is that the drain is clogged up.
The drain can be cleared by rodding it with a long thin object such as a knitting needle. You can then pour some water down it to make sure it drips out at the back.
If the door seal is poor then it would be time to replace the fridge.
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