Try using good vacuum cleaner for cleaning the carpet or products that are sensible to get stuck in vacuum cleaner. Ask the landlord that you could have hide the incident but as a good renter, responsibly you have said him the carpet problem occured. Now if it’s a costly one, you can have words with your landlord and come to a point where you both can share the replacement cost, tell him even your vacuum had faced a problem due to strand of carpet.