If the call centre does permissible work, then it is permissible to work there, even if it is owned by an individual who deals in riba or belongs to an institution that offers riba-based services. That is for two reasons:
1. What matters is that the nature of the work is permissible
2. It is reported that some of the Sahaabah did work for the Jews, who deal in and consume riba.
For more information please see question no. 82617.
And Allah knows best.