Calls interrupted

[InternationalBB]

Hello. I have the following problem: Whenever I start a call I hear the "Bundle call" message and after a minute and so the conversation ends with a message displayed about my ballance. I use the International Big Bundle. It happens regardless if I'm calling abroad or in the UK. Can you please help me have a descent conversation?

[Anonymous]

@InternationalBB Hi, do you have minutes available? 

[InternationalBB]

I do. Almost a full package. Plus I have some spare credits just in case.

[Anonymous]

Probably best to phone customer services to find out what's going on then.

[MI5]

@InternationalBB 

You can ask customer service to switch off the balance notifications (the ones after the call) but the "bundle call" notifications cannot be disabled.