Poor service recieved

I am really not happy with the service received, last month I bought a Huawei P smart phone at Canal Walk Huawei store, I used my card to pay for the phone and the lady that was assisting me with the purchase advised me that their printer is not working and therefore she will email me my slip ( Proof of Purchase slip), I gave her my email address and guess what, I still have not received my invoice till today. I have been calling the Huawei customer care line and been told that they have sent it however nothing, I needed this for insurance purposes. Now my phone is not insured because of a mere invoice.

This is truly tiring, I need to know who is going to be liable for any damages to my phone should anything happen to it now?