Delivery

I have been waiting for my package since the 19 December, when I noticed that the number that was used is my old number that is no longer in use I contacted your customer service through the whattsup number. I have been getting whattsup messages that my package is out for delivery everyday but when I contact you guys to update my number no one answers me, then when I track the package I get a notification that there’s no one at the delivery address but am always here at home waiting, today some agent finally answered my whattsup after 4 pm but I sent my message at 9am telling that my was package was returned coz there’s no one at the address. What's the use of having a customer service line if your agents won’t assist us with our queries since 19 December. I know tomorrow am going to get the stupid annoying whattsup that my package is out for delivery.