Worse service from rain

I got my rain router from this month , my premium goes off on the 25th , it went off the 25th of July fine , we had WiFi in the house till n it was on 4g , n from Thursday last week I don’t wat happened but it moved to 5 g and since then I don’t hv internet , it has signal but no internet, I hv called the whole week since last week Thursday n I did not receive any help , I hv since be told that consultant/ technician will call me but nothing, my other sim does not work as well . I shopping around for another network as we speak .