Bad taxi that they gave me

I went to buy taxi at I n S motors in vereeniging, it was last year December 27(2017)... Im very dissapointed on service that they gave me....i trusted them but they failed me big time on quantum that they sold to me...13 seater vehicle but when i went home to read the contract the papers stated that its a 15 seater , after i checked the spare wheel only to find out its a tazz spare wheel,after i called them,they told me they will send someone with a new spare wheel Again only to find out the wheel that they gave me its worse than a tyre can be, i decides to make living with the vehicle to transport school kids, not Even week i started this business the taxi keeps on stucking and stuckng, im calling them almost everyday to tell them that their car is not even a full month and it keeps on cutting of while I'm driving,last now they came to tow it and took it to gear box and diff,still there is no hope for it to get fixed,i called them again telling them my business is standing still because of them, I'm using other people's taxis to collect my kids which cost me everyday R600 a day out of my pocket,at the end i have to pay their money in of the car...which i even did... I told them my problem they told me i MST pay installment of taxi and i did after they never considered my problem they always keep me on hold and hold. ..i decided that i don't want it any More,they told me will send truck to come and collect it,its now 3days no hope again...my business its stuck stuck stuck,i need help to get another taxi from them of refund