Mistakenly Ordered a Data Sim, For My Phone.

Hi, I have had no proper phone connection for 3 weeks and I don't know how to go about sorting it.  I have 2 Smarty Sims, one goes into my router for mobile Wi-Fi on my boat, (No PAC) I pay £12.50 pm for 100GB and I am happy with that. But with my 2nd Sim I mistakenly ordered a Data Sim with my PAC number and also mistakenly signed up to a group plan. I can receive calls and Texts, but cant call out/Text or use the Internet. When I try to order a Monthly Mobile Phone Sim, it says I cant move to a monthly rollover from a Data Sim. So all I want is a normal phone Sim with my PAC number on it and to delete the Data Sim, but my PAC number is on the Data Sim. I don't want to leave Smarty but if I cant get this sorted in a week, I will have no choice.