Is It Safe That I Accidentally Ate What I Thought Was Plastic, But Was Told It Was Cheese?

hello please help me i m portuguese and i was making a lasegna and it had film it didn t look like it was too frozen I put it in the oven and then I took it out and saw that there was something strange they said it was cheese but I thought it was plastic I took the top part off and ate it maybe something will happen to me