I finally couldn't stand it anymore and paid the remaining amount that 'I haven't paid' according to them.
The customer service went missing for past two days 26th and 27th October 2021.
Developer Response , Hey there Sakakime, we are so sorry to hear about your experience, Thank you for taking the time to drop us your feedback.
Or shall I get Police to prosecute him.
Even after blocking some of their rude callers, they continued to call with other mobile lines.