new compressor/dryer not getting cold.has correct amount of freon with rear air

i added charge and brought it to 50 psi low side it got cold then in the mornin it was back to my question. is this still the needed repair. we paid 1500 for someone to replace those parts but we think he srewed us. the dryer looks new. also the copressor but dont know what he did. he said he the only thing he didnt replace is the condensor

you added charge after the repair?? 50 lbs on the low side is too high. pressures never indicate freon level. from the sounds of it, it is overcharged to start. what does your receipt say as to the parts replaced?? Roy once again, your low pressure is too high. the orfice tube is the expansion valve. the dryer must be replaced and the system must be evacuated for 30 minutes. you need to install the exact amount of freon for 100% effeciency. Roy

thank you roy