huawei is ****mers

So i was called to upgrade, the sales person Muzikayise Radebe upgraded me to the Pura 70 Pro and told me i get free gifts a watch and pod's, so i did the upgrade and now a week later my phone was delivered and now watch and pod's, so he told me to submit the invoice to Huawei and they will send me the gifts, so i did just to be informed the invoice cell c gave me is incorrect and now due to this i can not submit to get my gifts any more as the voucher is not valid as the inv was incorrect and i can only submit one invoice. so now I don't get anything and he does not assist me in any way and I cant phone him and he does not reply to my emails. you are ****mers, pls don't upgrade with cellc go anywhere els.