Hi ntombikayise114,
We'd understand you're having issues making and receiving phone calls, as well as recording audio on your device, and we're happy to assist.
For the issue with making and receiving calls, we'd recommend working through the steps in this article: If you can't make or receive calls on your iPhone
Regarding the microphone on your iPhone, take a look at the steps here: If the microphones on your iPhone aren't working. If you do not hear your voice clearly in the Voice Memos step, or if you have any further questions, reply to this thread and let us know.
Cheers!