MTN BAD SERVICE

I am so tiered off MTN'S BAD service, last year October my debit order didn't go off I paid a amount but when I tried to pay the balance of R532 it kept on returning as unpaid so MTN took the R532 in November with my original account amount. Now they keep on saying I owe the, they cut my phone every month for 2 - 3 weeks.

I AM SO TIERED OFF THIS!!!