High Fever from 02 oct night. Do now?

Fever started appearing drom 2 oct morning and we started giving paracetamol 120 mg per 5 ml after temperature reading was more than 99. It caused the temperature to go down upto 98, we consulted a pediatrician and he said to continue it and in case temperature doesn't come down by a degree after 1.5 hrs then give 2.5 ml Maftal P syrup. Same was followed but we required Maftal once on 03-Oct however we required Calpol every 6 hours. Now the problem is temperature is coming back and reaching to above 100 level within 4 hrs of giving paracetamol. As already we tried it from 2.5 days and temperature is not going down what we should do now? I feel like paracetamol worked for 2 days and that too, after giving it every 6 hours and now it is not working as temperature is increasing just before 4 hours of paracetamol administration.