The first PHP Notice (which may not be a problem) is from a line in your Custom Code - you might want to take a look at that
The best way of handling the Multiplier data is to use a second table for the repeating name mail and phone and save separate records there for each set of values linked to the main table by the record id.
You will probably want to use two tables to save this data. One main one for the form data that is not in the multi field array and a second one for the multi-field records. You will need to link the two together by saving the main data first, then getting the Primary Key of that record - usually the id or cf_id - that ChronoForms will have added to the $form->data array. Add this to the mult-field data and use a second DB Save action with 'Multi save' and 'Save under model id' set to yes.
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