Constructive Dismissal? Shortened it a bit

The issue started when our company hired a new head for my department and things are not working that good for our departments image but lately me and a colleague had been noticing na kami ang pinag iinitan ng company for all the blames, for short our assistant dept. manager and manager, hr manager and our company owner had a meeting regarding our department.

A dept. meeting was called by my manager and it all started with him and our asst manager telling us na sablay daw ang dept and the main reason seems to be blamed on us kasi daw we do not perform well and as a plan and proposal daw if no great improvements shall be done before the end of March the company shall be forced to put us back to job sites and effectively dissolve our positions, 2 org charts was also shown by my boss yun isa was yun current setup namin and our positions included in the chart of Head Office HSE Department and yun isa naman nawala yun position namin and it was included below the head office part instead it was placed to project sites, I voiced out that we should not be removed from our positions since there is no proof that we are to be blamed, it came to a point also that me and my co-worker who happens to be a coordinator also in the department were stating na unfair naman na kami ang masisisi yet no Job Descrption and Duties were given to us despite na 1 year na yun position namin so paano mangyayari na kami ang sisishin. We also told him na we are very much willing na magharapharap in front of the owner para magka-alaman na kung sino ba talaga ang sablay sa department.

A week came and a JD was presented to us by my Manager, Asst Manager and HR Manager in front of the company owner in our regular coordiantion meeting and I simply told them that well review the JD bago kami mag sign which they accepted; we reviewed the JD they made and there were some clause that I find weird since the position were having right now is not new and 1 year na kami sa position na yun so its quite impossible.

Im attaching here important parts of my letter to them for a better picture.
1. Under job duties & responsibilities part which states that “To include, but not restricted to, the following duties” and “Performs and assume other duties and responsibilities as may required by the HSE Manager and Asst. Manager”  

It has been 3 weeks since I gave my boss our response letter regarding the above clause but till now no reply has been given to us yet pero non stop issues concerning our jobs and the dept. are still being thrown to us like a jobsite informing my colleague that the company owner informed their site manager that he (my colleague) shall be transferred to jobsite soon.

We are certain that we had been performing with our respective position since most memos and policies are made by us that also includes meeting including its minutes that are being precided by us, continous site visits, inspections and citation reports signed by us.

What can we do about the above since we are really bothered on the deliberate pressure the company is giving us and it seems na lahat ng trabaho pinapagawa na samin to a point na para malaglag kami kapag may nangyaring sablay.

Sorry if the story was too long pero pinaikli ko na po, Thank you very much in advance!