POOR VODACOM SERVICE

It is unbelievable how Vodacom ****** me from my data i have a WIFI router that comes with 5G NIGHT TIME DATA and 5G DAY TIME DATA, for a few months my data just disappear, when i phone them they always have the same excuse that my phone apps is not restricted for back round data, which is a load of nonsense. How can 650 MB LAST FOR 15 DAYS AND 5G LAST ONLY 6 DAYS? it is impossible and than the lady from Vodacom told me that WI FI routers USE MORE DATA then your mobile phone?This is unacceptable, i don't want this contract anymore and do not know how to get out of it. I'am sick and tired really!!! **********