Webkul Software — webkul opencart marketplace - refund or replacement of the extensions

Hello
I bought 15 opencart marketplace extensions from webkul, but only 5 works correctly.
2 of these extensions: mercado pago and correios have several brazilian market rules these modules have not been implemented. I opened several tickets to solve, but no one answered and we had to hire another company to develop the checkout because we have deadlines and commitment to clients.

We asked for the refund or replacement of the extensions, i was treated like garbage and nobody made any decision, as soon as the messages answered.

Webkul is the worst it company we have ever worked with and technical support is horrible too.

Geraldo