Is Lebara a scam

I have credit on my Lebara mobile number and have received multiple countdown threats to cancel the account if the SIM is not used, on the last two occasions I've both made calls and attempted to send a text whereby my credit has then been reduced only to receive yet another threat to cancel the account unless I make a call. Is this Lebara policy in order to force customers into having a plan.. which I had for many years without using which is why I opted for pay as you go with top-up credit.
If so this isn't an issue I'll get a refund for my remaining credit and cancel my account.

I'm a newer user and mine wants a monthly plan instead of trying to top up and not pay for a while. I actually had the thing active for a few months and paid monthly while i was out of the country of UK and didn't actually use the SIM card, which I had in a drawer. Maybe I am the bad customer that makes them like the practice of monthly pay, instead of being smart like you and doing a top up style so that i save money while I'm out of the country.
Somebody else bought the SIM and set it up for me, so they probably just want with what Lebara wants customers to use rather than optimizing on cost