Please help to translate to english. Thanks

Dai Sun Company is a company with sole proprietorship which also runs by one person. The responsible person of the company (legally) is Mr Tong Cheung. Mr Ton Cheung's mobile phone service is already terminated and the company register address are unknown. We have not got any way or method to get contact with this company's responsible person (Mr Tong Cheung) again to chase on our company's lost goods, but we will keep doing our best to work on this, to investigate and to follow up closely. Hope that we can still stand a chance on claiming/getting our lost properties back successfully.
We sincerely hope you can understand this situation.

* not know how you would like to use this letter, but you might consider whether you should put the word 'legally' or not there :)

** We have not got any way or method to get contact with this company's responsible person once again to chase on our company's lost goods

I think is better to just write the name instead in here, coz in the begining already stated clearly Mr Tong Cheung is the one who responsible for this company.... so, I think if I were you, I will just write "We have not got any way or method to get contact with Mr Tong Cheung again to chase on our company's lost goods"