MTN contract is a **** and *******

MTN south Africa is a **** and I want out.... I've joined their contract where I'm supposed to pay R179 per month for 50 gig... I gladly took the contract because I'm a student who badly needs data since I'm unemployed but I'm being ****med and got what I didn't sign up for.... I get 25gig internet data (I wanted 50 gig per contract) and I get 25 streaming gig (who said I wanted to stream? I just wanted data not this.. There's to much hidden fees... They were supposed to deduct 179rand but they took R358 I understood because they gave me the data mid month... Now it seems they want to deduct R358 again.. I'm a mother of 2 whose single and unemployed I didnt know I'm inviting problems.... I wanted 50gig at R179 now I wanted them to cancel... They tell me I need to pay up R800 As a early cancelation fee... @Mtn is a **** they trapped me and know I won't have a r800 to cancel I'm forceful trapped.... Please help me