First of all, you are presumed innocent of a crime. Once the company conducts an investigation on the matter, you must prepare for your defense by documenting your call logs, phone messages, and other pieces of evidence whether in a paper-based or electronic format. In the event the company decides to sue you, it will file a criminal case against you, where proof beyond reasonable doubt is required. It can also lodge a civil case for damages where superior weight of evidence in its favor is needed. In both situations, the company needs to establish your guilt/culpability. After presenting its evidence, you may either move for dismissal for failure of the company to prove your guilt/culpability or proffer your defense evidence.