Ugrade enquire

I have send an email on the 2 October regarding an upgrade enquire. No response after I specifically stated in my mail that I am not allowed to answer personal calls during office hours and they need to corrrespond via email. Send the same email on 8 Oct via messenger and fhey stated that I gave a timd which is suitable for them to phone. I gave the time 18:00. No phone call received. 9 Oct I ask on messenger to phone mr 12:00 and no phone call. I requested again that we must correspnd via email due to the fact that I am not allowed to have personal calls during office hours. Since the 9 Oct till today no response via email or phone call after 17:00 in the afternoon which is after working hours which is suitable for me. Poor customer service😡