Unhappy and frustrated new customer

Good day

I really need urgent help I think something went wrong at the tower with rain connection because three weeks back when I received my sim card for the first time on the 7th of July up until the 13th July connection was very perfect and the speed was fast. Since the 13th connection went off and sim showed Emergency Calls Only with no any bar of signal. I reported the problem and a sim replacement was delivered on the 21st July but still no connection but bars do show. I think something went wrong at the tower close to where I am. It's sad that I would have to pay a full amount for the month whereas I used data only for 6 days. I am so frustrated because I'm a student and I thought rain will save me money on data. I really need urgent help.