My husband has visited Singapore on a tourist visa many times in the last 2-3 years before 2018. The last time he visited was on February 25, 2018, but due to an emergency, he had to come back to India on March 3rd.
He went to Singapore again on March 16th, but at the airport the ICA refused to give him entry. The officers took him to a room and told him to sit there for 2-3 hours. After this time the officers returned and told him he needed a local sponsor whenever he comes back. Without saying anything else or disclosing any other reason they sent him back to India. He did not get any stamp (ban stamp, etc.) on his passport.
A year later he got a local sponsor (his friend) and he applied for his visa on March 16-17, 2019, but it was rejected with some queries by ICA. He fulfilled the requirements asked for by ICA and sent everything by email, but his application was again rejected after one week.
What is the reason behind this? Has he been blacklisted or is there another reason? ICA did not give him any stamp, and they did not disclose any reason for refusing him entry to Singapore. Please advise on how we can deal with this problem.