(Reuters) - Tesla Inc Chief Executive Elon Musk tweeted that the electric carmaker was "deep in production hell", just days after the company said it would fall behind its planned ramp-up for the new Model 3 sedan due to production bottlenecks. Tesla has been struggling to meet delivery deadlines on Model 3 and in the most recent quarter missed its initial production target. Shares of the company showed little reaction to Musk's replies to Twiteratti, complaining about the company's production delays. In response to a Tesla customer asking if he would get his car delivered this year, Musk tweeted, "December will be a big month, so probably, but it is impossible to be certain right now." The Palo Alto, California-based company delivered just 220 Model 3 sedans and produced 260 in the third quarter.