No Good First Impression

I'm having trouble getting through to customer service via the WhatsApp channel, I don't know what my actual prorata amount is that I have to pay after installation (Which wasn't explained to me during/after sales), and the customer service calls me when I can't answer calls at work, when I ask them to call me after a certain time, they never call. AND I also want to revoke the permission I gave Cartrack to distribute my information for marketing purposes because now the calls coming in are insanely coming in numbers!