Incorrect policy data and incorrect motor premium

Migration from S***S (Old Mutual Staff) to Mutual & Federal was done without data integrity which caused incorrect data/motor premium being charged! I informed M&F numerous times of the errors on my policy, but instead of fixing it correctly i was informed it was correct! I had to approach Toyota for the correct details and value of my car! According to Toyota my car is currently under insured! My Toyota was insured for R103000 (replacement value), but is now insured for R72000 (book value) after the migration and i am paying a 14% higher premium? The extras on my car is also not noted which was included in the previous insured value! I have made several efforts to address these issues, but my correspondence/complaints is being ignored by M&F? I have it on record from S***S that this migration was done for the benefit of M&F and to get rid of some clients???