unhappy client

I lost my sim card and I called about the replacement. They told me , I should buy a sim card which I did. I tried call them for last week , its either they don't answer or put me through to the extension that does not work or picked up.

I send messages on whatsApp number on the 21st December 2018 and I got respond that does 28 December 2018 the send the department dispatch operation. I don't know how long will it take them to resolve, they cant even pick up the phone.

I will appreciate if they could just pick up the phone and resolve my issue. I don't think its can take the whole day to do that, or they inform us the customers that they are not working during December I will really appreciate it.

I also send numerous emails to them. its effecting my business.