Pathetic service from ***** department!!!!

I logged a dispute with the Card Dispute department on the 25 June regarding ********** transactions that have been going off on my card since December 2018. They blocked my card and no further updates were given regarding my investigation. I then followed up on the 9 July and asked for an update. They responded on the 12th July saying that funds were credited to my account on the 1st July and nothing was mentioned regarding the outcome of investigation. I received my bank statement at the end of July and saw that only 4 months were refunded into my account and not 7 months as i stated in my dispute form. I have been sending mails and calling with no answer. Why is no one getting back to me? is this being swept under the rug because its an inside job?? I want a full report as to what happened, how it happened and i want all amounts credited to me including the interest i incurred on my card because of these transactions.