Unfair Treatment During Leave: Absconding Accusation for Work Email

I had requested a leave of absence for five days to travel, which was approved by my manager via email. Prior to commencing my holiday on Friday, I had a discussion with my manager and informed them of my plans. On Friday evening, I departed on a flight and was unable to respond to messages upon arrival in a new country due to a delayed internet connection. However, upon regaining connectivity, I promptly messaged my manager to provide updates on my project’s progress. Despite being on leave, I remained engaged in work-related communication. On Monday, attempts were made to contact me again, but I was unavailable as I was still on holiday. Then on Tuesday, I received an email accusing me of ‘absconding’ from work, stating that attempts to reach me via Slack and WhatsApp had been unsuccessful. However, I contest this accusation as I had promptly responded upon regaining internet access. It appears there may be a misunderstanding regarding my availability during leave. Regarding the issue of contract terms, while there is no specific mention of working hours in my appointment letter, the termination clause states that termination may occur if there are reasonable grounds to believe I have engaged in misconduct, negligence, breached the contract fundamentally, or caused losses to the company. Furthermore, my salary for the previous month has been withheld. Given these circumstances, I seek clarification on the next steps to be taken. Should I consider resigning without notice, or could there be potential legal repercussions? I possess evidence of the approval of my leave.