Uts Solution — getting phone calls regarding payment

Same thing happen with me, i received a call by quickr and i started work with uts solutions and they say if work not done by 90% accuracy you pay 6700/-
After i submit the work they say your accuracy is below 90% so you pay 6700/- for noc... Otherwise they legal work on me...
I am a student and very difficult i pay 6700/- they torching me again and again about legal work...

What i do please help me...