After months of waiting, incorrect amount was refunded (less than half of the original ticket

After waiting MONTHS for a refund to process, an amount less than half of the total ticket cost was refunded. I notified Travelstart of this, they said the relevant team will get back to me within a few days. Once again, its been more than two weeks now and I fear it'll be a few MONTHS before they eventually respond and probably tell me that they can't refund me the rest of the funds due to some arbitrary reason! I hate to be this negative but judging from other people's reviews, this seems likely the realistic outcome. Can someone from Travelstart please assist me regarding this?