Failure to uphold agreement and poor customer service

I did an upgrade on the 4th March 2019, as part of my upgrade as per my quote I was informed that I would receive a pair of wireless Bluetooth Huawei buds(earphones). I eventually received the device on the 26th of March due to stock issues which I understood, however the buds were nowhere insight, I followed up and was promised that warehouse would contact me, I allowed for the 3-5 working day generic response but no contact was made, I then called again but unfortunately due to poor and pathetic customer service I was pushed from pillar to post about the arrival of the buds. I was promised callbacks from team leaders but received none. I contacted the upgrades and aftersales team as well as customer service . I've tried on multiple occasions to get this matter resolved but to no avail. I would now appreciate this matter resolved as soon as possible.