Poor service

I learnt that on air is doubling my debit order by taking funds from my 2 bank accounts. I called to get the issue fixed, the consultant said they’re escalating my query and that was the last time I had from them. When I try calling, the line is always busy or not answered, their WhatsApp platform is not functioning, they don’t respond but everyday I get marketing messages from them on WhatsApp🙄🙄