Cell phone contract

Hi, i bought a phone P10 Huawei in September the 26th 2017. The agreed payment for this phone it was R269.00 since then i haven't paid this amount. End of October I pay around R500. 00 which i understood that i am paying for the few days of the previous month. Till today my bill is never R269.00. I called the call center several times regarding this issue. My problem was never resolved. End of December they have debited R852. 00 which it came as a surprise to me i when to the shop were i bought the phone they told me that is the speeding limit which their call center said is on the zero rand. And again end of January it came the same amount. And again my contract doesn't have my physical address and my email as a result I am pay but I don't know for what and i was paying for the postal bill. Last night I received the call from call center saying that I should make the payment within 48 hours and if i don't they will close mt services.