Retrenchment vs Redundancy

I was retrenched by my employer of 2 years & 7 months but the company is not in any financial difficulty as mentioned by my manager as he explained to me why I am being terminated. They're even sending employees on a 4-day all-expense paid trip to Australia for being in the company for 5 years. The company is going through reorganization, he said, and was advised by their operations consultant to hire an agency for creative works instead. Which makes me think that my termination should fall under redundancy. Even more, they didn't include the 6 months probationary period in my separation pay computation. The HR won't even provide legal references as to why my probationary period wasn't included in my separation pay computation. The HR just keeps on spamming my work email with an "End of Employment" PDF file containing my separation pay computation that I'm supposed to sign. I believe that they are trying to pay me less than what I should be receiving for my separation pay. Is my gut feeling right or wrong?