Pillar to post service

I contacted Vodacom to enquire about why the internet speed of the router I'm currently using is so slow and the possibility of boosting the wifi. I was put through to different departments and eventually they put the phone down in my ear while I was still trying to explain. What is weird is that usually they will ask to verify details and then assist. This did not happen and neither the assistance. I'm working from home and are dependant on the efficient operation of the Vodacom router. I have four contracts to be upgraded next month, but if this is the care, then I recon I must perhaps take my business elsewhere. What to do.......?