Solve mathematical model with meta-heuristic algorithms (MATLAB), Or Exact solution (GAMS)

Hi The mathematical model of the supply chain has three relatively large objectives with about thirty constraints. This mathematical model also has two subset models; part of the answer of these subset models is in the primary model. The project is that this model should be solved and give a thoroughly logical answer. Moreover, sensitivity analysis should be done for the model to prove its accuracy. I defined a case study for it, but this case is general, and there is no exact data, and the data must be generated randomly but logically. All models prefer to give an accurate answer (with software such as GAMS), but due to the model's size and its non-linear part, the solution using hyperbaric algorithms is not a problem. (Priority of exact solution of the model after that hyperbola) Those who specialize in this field, please send me a message to send the model to them. (If necessary, the written code should be taught)