Singapore airlines - Food poisoning and NO feedback from them to date

My husband and I flew to Japan via Singapore on Singapore airlines in May 2019. On the second leg from singapore to Japan ( Tokyo) he ate some food which he thought did not taste right. Upon landing he did not feel well and had terrible stomach cramps. When we landed the gentleman in the seat in front of us had the same cramps but to a point that he could not get up from his seat and needed assistance. To date after writing numerous emails they have not acknowledged our complaints or given any feedback. This is supposed to be a top airline. My husband was to sick that he did not eat for 2 days and was ill. Be very very careful what you eat on Singapore airlines. One would expect some communication from an airline who claims to be on top of their game!