Bad service ,unwanted spend limit wallet

I took a contract and wr agreed to pay R209 pm for 80/80 GB to my suprise I have been paying R719 ,when complaining about it they told me about monthly limits things which they never told me about initially when I ask to cancel that spend limit thing I get no assistance, been calling and sending emails no help I am getting. Even if I didn't make any call but I will find myself owing due to the nonsense spend limit thing. Can telkom urgently address this and make my contract hybrid ,I want to be able to load myself airtime not this spend limit wallet I don't want it or can they cancel my contract asap . From R209 to R719 ,no.

Siyabonga Simelane *** Thank you