Furious client

So i took a wi-fi router for 20gb, 10 day & 20 night for 200pm until last month i was billed 700 & I'm told i have a 500 that i can use but i don't know when & how but I'm using it. For the past 6 months each time i reach my limit i get an sms that data is depleted including last month but apparently i have use this 500 & in 1 day because is airtime & not bundle. The network coverage is terrible & to get hold of them is a mission and their branches can't assist.

I am so dissapointed & i will never in my life buy or refer anybody to them.

I just want my contract cancelled.