Says collection exist on insertion even

Hi I have already created collections but when I try to insert add object it says class already exist why so?

my code

collection_name = f"Collection_{request.collectionId.replace('-', '')}"
        data_row = {
            "filename": request.id,
            "filecontent": request.text,
        }
        print(f"Passing file : {request.id}")
        collection = client.collections.get(collection_name)
        with collection.batch.dynamic() as batch:
            batch.add_object(properties=data_row)
        if len(collection.batch.failed_objects) > 0:
            print(f"Failed to add objects: {collection.batch.failed_objects}")
            return {
                "status": "error",
                "message": f"Failed to add objects: {collection.batch.failed_objects}",
            }

error I am having

“message”: “Failed to add objects: [ErrorObject(message=‘WeaviateInsertManyAllFailedError(\‘Every object failed during insertion. Here is the set of all errors: class already exists: found similar class "Collection_83cdb7b2569a428095e38b73e8348168"\’)’, object_=_BatchObject(collection=‘Collection_83CDB7B2569A428095E38B73E8348168’, vector=None, uuid=‘dbcf23f4-bdbc-46b1-bc2f-5398eaf75dd4’, properties={‘filename’: ‘B7139300-9CC7-45F0-8096-we’, ‘filecontent’: ‘Saasdfadfs 234 234iddrsdf asdfade!’}, tenant=None, references=None, index=0, retry_count=0), original_uuid=None)]”