Vodacom bad service

Trying to upgrade for 2 months now went in store to Northgate 5 times they keep coming back no they are sorting it out, which did not happen Ordered online yes they placed the order after 4 days whivh yhry should of delivered keep having to phone because they are " offline " whisk after 12 phone calls no they are sorting the error. Maybe Monday. This is not the only problem. Pay account in full then after 2 weeks they cut the line saying account in arrears, Pay again then again after 2weeks no account in arrears which carries on and on.