Property Management Company issues

Bought an apartment last year as an investment. Ongoing issues however with the management company.

There are 2 problems.

1 - The intercom doesn't work. Technically it will allow people in, the door release button is functional. But the intercom box at the front door is badly rusted and clearly there is water inside. When you ring the bell or lift the receiver inside the apartment you get a loud high pitched noise which basically drowns out anyone talking.

2 - It's a block of 6 apartments, 4 occupied. Some of the other residents/tenants have a habit of leaving the main block door on the snib meaning anybody could walk in. Aside from the obvious security risk, this would probably invalidate insurance claims if it could be shown that the property is being left like that.

I have spoken to the receptionist at the property management company a few times. First off she didn't return my call. Second time I called she claimed that an electrician had checked out the intercom and it was fine, meaning that the issue was in my apartment only. I didn't really believe her, but I went ahead and got my own electrician to check out the handset in the apartment, which was fine. He confirmed that the issue is due to water getting into the rusty unit at the door.

Regarding the snibbed door, she claimed that it was due to a set of problem tenants who would be moving out shortly.

2 months later, the problem tenants are gone and still the door keeps being left unlocked. Same girl told me that she will get a sign put on the door asking tenants to keep it locked for security reasons. That was 3 weeks ago and the sign isn't up.

I'm about to call them back and insist on speaking to the boss as the receptionist is basically taking the mick at this point.

I'm just wondering what my rights are? At the end of the day the company can't be held responsible for each and every resident and their refusal to close the door properly but they don't seem to be trying very hard either. And as for the intercom, do they need all residents to complain or can I force them to take action myself? When I spoke to them before about an issue on the roof (shared space) that needed to be resolved they basically said that the cost of the repair would be divided up and added to the next year's fees.

Surely that should come out of the funds they have already? First time dealing with a management company so I'm a bit green. PS this property is in the North if that makes a difference to advice!