Worst service ever

my account no is i***9 - i was contacted by a Vodacom agent regarding a upgrade, i upgraded but did not take new handsets however i received a account of almost R5000 in March when i queried it they told me i was paying for a upgrade with effect January 202, so for 3 months i paid for a new upgrade and the existing contract all way back to January that i was on, it was never sorted out, i advised i am a 63 year old women and cannot pay that much, that is my food money, i have for 2 days tried to phone every contact no on the website and left call back requests i get rerouted to a recording as i am in arrears, when i got hold of someone they could not access my account and put me through to another consultant needless to say i was disconnected, i tried for 2 hours to get hold of someone, it is appalling...i want to cancel everything with Vodacom with effect today 06.05.2021... i know i will get penalized but after being with Vodacom for 20 years to be treated like this ...i wonder if i will even get a response on this complaint