Cameo, it will always depend on the package that you have and your typical usage. However, the one thing that you can probably say for certain is that a phone call (mobile to mobile (Globul or a.n.other) or mobile to landline) will never cost you more under contract than on payg and will usually be a lot less.
An example, I have a MTel contract now (used to have payg) which costs me 9.95 leva per month. I typically spend 15-25 leva per month, including that 9.95 charge (because my requirements don’t fully match the basis for the plan), but when I was on payg I was spending typically over 30 leva per month. So, in the long run, I am saving. I’m sure that it would be a similar situation with Globul.
See the other thread about what documentation is required from Globul, if you enter a contract with them.