No internet access

I’ve been struggling enough with little to no internet cover since the end of July. I’ve requested call backs but haven’t received any. A friend across the city recently reversed her monthly debit because of the same issue. I can’t be paying R600 for 2gigs of data. I shouldn’t even be depending on the sims to stay connected when I have a “fully functional” router I’d like to know how to cancel and get reimbursed.