VakıfBank Overcharged Me for Home Insurance Renewal

I took out a home loan from VakıfBank, and as a result, the Sarı Panjur Home Insurance package is automatically renewed every year. This year, the cost was set at ₺6,300, while the same package is available from insurance companies for ₺2,500. I went to the bank and requested to arrange the Sarı Panjur home insurance package externally. However, they told me, "No, we have agreements with certain banks, and it’s not possible." When I mentioned that the amount was too high, they asked me to provide a declaration from the insurance company proving I could get it for ₺2,500. The insurance company refused to provide an offer, stating it was not legally permissible. The bank requested a discount from Türkiye Sigorta, but the company refused, citing a claim I made last year for an appliance repair. I asked the bank for time to arrange the insurance externally, but they did not accept. I should not have to pay ₺6,300 instead of ₺2,500. I kindly request your assistance with this matter.