Interacting with women in the work place

I work in a call centre and my role involves taking calls and speaking to customers. Some of them are women. Unfortunately, living in the UK it's hardly avoidable not to find employment that doesn't involve having some interaction with the opposite gender with the exception of some sort of manual labour work which, is tiresome, and pays very low for long hours. That's not ideal with everything so expensive here now. Alhamdulillah, I try my utmost best to minimise as much interaction as possible. There is never any physical contact just eye contact, and verbal communication. I never do the following:

- Have dinner with them during lunch hours

- Play pool with them during lunch hours like other brothers

- Engage in causal chit-chat, but strictly work related when necessary, only gentle response to a good morning or when they greet me with a pretentious smile

- I never offer them or accept a drive home or to work

- I never get in the elevator if there is more than one female

I always say astagfirullah as much as possible for any shortcoming and just for interacting even when I needed to. With this in mind, am I still sinning working where I am? Allah says in the Qur’an to fear him as much as we can, and I do my utmost best, but it is also frudh for a man to make a living for his family.