Disgruntled Axxess client!!!! faulty router

Uncapped (incl. 10/10Mbps Vumatel Line)

I have been a client of Axxess for the last 6years, mostly very happy with the service. However, I am currently not very happy. Im disgusted to say the least. I migrated from ADSL to Fibre in May last year , received a new tenda router. For the last two months, our wifi devices in the house cannot connect to the 2.4G only to 5G, this we discovered only when i bought a new cell phone for my son and his is not 5G compatible so his phone specifically is not connecting at all. I have numerous emails, calls to AXESS to reoslve this matter. They only do telephonic suport becaur their head office in PE. im speechless, ..Wve tried it all, but the worse . I rely greatly on WIFI but a service that WORKS. ive been paying all the time and no one is getting back to......i am ready to move my account to another service provider